STD Tuning Drivetrain Diff. Ring gear sizes?

Diff. Ring gear sizes?

Diff. Ring gear sizes?

 
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2.5-10
Nothing Clever

67
06-24-2009, 06:10 PM #1
hello all,

does anyone know the ring gear size in a 240D diff.? 115 or 123, should be the same I'd think.

or a late model 560 SEL?

I'm trying to figure out if my 240D has a big enough gearset to take the torque from the 560's motor

Thanks much.
-Erik

1976 W115 medium red/tan 240D (undergoing M117 heart transplant)
1989 BMW E30 327iC SETA 5MT
1987 white/black 190D Turbo Diesel - Recaro 16V seats, Monoblocks, 11PSI.
2009 white/black C63 ///AMG
1987 BMW E30 325E M50B25NV 24V swap 5MT. 5 lug.
1999 white/grey ML430
1991 BMW E30 318i 5MT (Beater)
1990 BMW E34 525i 5MT
1997 red/black/black SL600
2.5-10
06-24-2009, 06:10 PM #1

hello all,

does anyone know the ring gear size in a 240D diff.? 115 or 123, should be the same I'd think.

or a late model 560 SEL?

I'm trying to figure out if my 240D has a big enough gearset to take the torque from the 560's motor

Thanks much.
-Erik


1976 W115 medium red/tan 240D (undergoing M117 heart transplant)
1989 BMW E30 327iC SETA 5MT
1987 white/black 190D Turbo Diesel - Recaro 16V seats, Monoblocks, 11PSI.
2009 white/black C63 ///AMG
1987 BMW E30 325E M50B25NV 24V swap 5MT. 5 lug.
1999 white/grey ML430
1991 BMW E30 318i 5MT (Beater)
1990 BMW E34 525i 5MT
1997 red/black/black SL600

winmutt
bitbanger

3,468
06-24-2009, 07:30 PM #2
(06-24-2009, 06:10 PM)2.5-10 I'm trying to figure out if my 240D has a big enough gearset to take the torque from the 560's motor

No, you will need the bigger drivetrain. The most immediate failure with the 240 setup would be the flex disks.

1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
OBK #42
winmutt
06-24-2009, 07:30 PM #2

(06-24-2009, 06:10 PM)2.5-10 I'm trying to figure out if my 240D has a big enough gearset to take the torque from the 560's motor

No, you will need the bigger drivetrain. The most immediate failure with the 240 setup would be the flex disks.


1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
OBK #42

ForcedInduction
Banned

3,628
06-24-2009, 08:09 PM #3
The V8s use bigger flanges and flex discs. That V8 would be screaming down the highway with a 3.69! It would get to 120 real quick though. Big Grin
ForcedInduction
06-24-2009, 08:09 PM #3

The V8s use bigger flanges and flex discs. That V8 would be screaming down the highway with a 3.69! It would get to 120 real quick though. Big Grin

2.5-10
Nothing Clever

67
06-24-2009, 09:22 PM #4
(06-24-2009, 07:30 PM)winmutt
(06-24-2009, 06:10 PM)2.5-10 I'm trying to figure out if my 240D has a big enough gearset to take the torque from the 560's motor

No, you will need the bigger drivetrain. The most immediate failure with the 240 setup would be the flex disks.

(06-24-2009, 08:09 PM)ForcedInduction The V8s use bigger flanges and flex discs. That V8 would be screaming down the highway with a 3.69! It would get to 120 real quick though. Big Grin

I'll be using a 560 flex disc with a custom driveshaft trans -> diff, I just want to know if the 240's gear set can take the 300+hp and 320lb/ft this motor will be putting down, and if it cant, whats a beefy dif that will direct bolt to the W115?

I have no problem with 3.69 gears, I want good mileage even if its a little bogged down off the line Big Grin

1976 W115 medium red/tan 240D (undergoing M117 heart transplant)
1989 BMW E30 327iC SETA 5MT
1987 white/black 190D Turbo Diesel - Recaro 16V seats, Monoblocks, 11PSI.
2009 white/black C63 ///AMG
1987 BMW E30 325E M50B25NV 24V swap 5MT. 5 lug.
1999 white/grey ML430
1991 BMW E30 318i 5MT (Beater)
1990 BMW E34 525i 5MT
1997 red/black/black SL600
2.5-10
06-24-2009, 09:22 PM #4

(06-24-2009, 07:30 PM)winmutt
(06-24-2009, 06:10 PM)2.5-10 I'm trying to figure out if my 240D has a big enough gearset to take the torque from the 560's motor

No, you will need the bigger drivetrain. The most immediate failure with the 240 setup would be the flex disks.

(06-24-2009, 08:09 PM)ForcedInduction The V8s use bigger flanges and flex discs. That V8 would be screaming down the highway with a 3.69! It would get to 120 real quick though. Big Grin

I'll be using a 560 flex disc with a custom driveshaft trans -> diff, I just want to know if the 240's gear set can take the 300+hp and 320lb/ft this motor will be putting down, and if it cant, whats a beefy dif that will direct bolt to the W115?

I have no problem with 3.69 gears, I want good mileage even if its a little bogged down off the line Big Grin


1976 W115 medium red/tan 240D (undergoing M117 heart transplant)
1989 BMW E30 327iC SETA 5MT
1987 white/black 190D Turbo Diesel - Recaro 16V seats, Monoblocks, 11PSI.
2009 white/black C63 ///AMG
1987 BMW E30 325E M50B25NV 24V swap 5MT. 5 lug.
1999 white/grey ML430
1991 BMW E30 318i 5MT (Beater)
1990 BMW E34 525i 5MT
1997 red/black/black SL600

2.5-10
Nothing Clever

67
06-26-2009, 09:35 AM #5
anyone know the ring gear size? is the 300D diff stronger? will a W201 diff bolt up, will my late model W126 diff bolt up?

I need it to take about 350LB/FT torque

1976 W115 medium red/tan 240D (undergoing M117 heart transplant)
1989 BMW E30 327iC SETA 5MT
1987 white/black 190D Turbo Diesel - Recaro 16V seats, Monoblocks, 11PSI.
2009 white/black C63 ///AMG
1987 BMW E30 325E M50B25NV 24V swap 5MT. 5 lug.
1999 white/grey ML430
1991 BMW E30 318i 5MT (Beater)
1990 BMW E34 525i 5MT
1997 red/black/black SL600
2.5-10
06-26-2009, 09:35 AM #5

anyone know the ring gear size? is the 300D diff stronger? will a W201 diff bolt up, will my late model W126 diff bolt up?

I need it to take about 350LB/FT torque


1976 W115 medium red/tan 240D (undergoing M117 heart transplant)
1989 BMW E30 327iC SETA 5MT
1987 white/black 190D Turbo Diesel - Recaro 16V seats, Monoblocks, 11PSI.
2009 white/black C63 ///AMG
1987 BMW E30 325E M50B25NV 24V swap 5MT. 5 lug.
1999 white/grey ML430
1991 BMW E30 318i 5MT (Beater)
1990 BMW E34 525i 5MT
1997 red/black/black SL600

SurfRodder
Jackass Extraordinaire

611
06-26-2009, 09:48 AM #6
the ring gear size is 185mm... the one in your 560 is 210mm... if you want to swap to the larger one, I know that an early(pre-1985) w126 diff will bolt up to the ass-end of the w123... and by leaving it with the 3.69, it will have better off the line performance, but not have as much top end potential, which also means not as good mileage potential... the good news is that the gear ratio in the 560 is 'used to' is probably the same one the early w126 v8s used, 2.47...

all that said, I doubt that you'd bust that 185mm diff unless you were doing power launches all the time, i.e. drag racing, but I do understand the urge to make sure it'll hold up...350lbf is a bit, but probably well within the capacity of the 185mm(~7.3") diff, now if you were looking to modify that engine for more power, def. go with the larger one.
anyway, if you want to hit up the yards, look for 1985 and older w126s with a v8 and crawl underneath and check the ratio that is stamped on the housing(flat spot on the bottom left edge of the face where the diff cover bolts on) it should be 2.47:1 which I think is still what they were running in the later models, either way, the v8 will have more than adequate power to push it...and if you have looked at enough diffs, youll notice right away that it is a bit larger than the w123...

the 300D will have the same diff, just numerically lower (taller) gears...201 and late model diffs wont bolt up, it may be possible to modify a later 126 rear subframe to fit the 123, and then the later 126 diff will work(let me know if you do that!) you can also swap the guts of the same size diffs around, but youll likely need a shop to set it up for you (apparently MB diffs are really difficult to set up properly w/o the right tools... im still gonna try it anyway)
This post was last modified: 06-26-2009, 09:57 AM by SurfRodder.

W123 Mods: 4 speed ** manual climate control ** '85 Kalitucky intake ** manual windows & full tint ** Euro headlights retrofit w/bixenon projectors ** 4 brake light mod ** Vogtland 50mm drop front & Lesjofors S600 drop rear springs ** 16" rims ** late w126 brake spindles, rotors & calipers ** full suspension rehab ** Bilstein HDs ** AL129X alternator & 1/0 starter and charging cables ** 300GD clutch/flywheel ** AFCO 80103N radiator & Earl's 41610 oil cooler ** custom block-off plate, remote oil filter & t-stat ** MW IP w/ tomnik's 6.5mm 'Holly' elements **

S124 Mods: 400E Rear subframe ** SL600 Brakes ** Late 300E 210mm diff ** SLK230 6 speed ** 17" CLK rims ** Vented RF Fender ** Facelift Hood, Headlights, and Lower Cladding **

OBK# 62
SurfRodder
06-26-2009, 09:48 AM #6

the ring gear size is 185mm... the one in your 560 is 210mm... if you want to swap to the larger one, I know that an early(pre-1985) w126 diff will bolt up to the ass-end of the w123... and by leaving it with the 3.69, it will have better off the line performance, but not have as much top end potential, which also means not as good mileage potential... the good news is that the gear ratio in the 560 is 'used to' is probably the same one the early w126 v8s used, 2.47...

all that said, I doubt that you'd bust that 185mm diff unless you were doing power launches all the time, i.e. drag racing, but I do understand the urge to make sure it'll hold up...350lbf is a bit, but probably well within the capacity of the 185mm(~7.3") diff, now if you were looking to modify that engine for more power, def. go with the larger one.
anyway, if you want to hit up the yards, look for 1985 and older w126s with a v8 and crawl underneath and check the ratio that is stamped on the housing(flat spot on the bottom left edge of the face where the diff cover bolts on) it should be 2.47:1 which I think is still what they were running in the later models, either way, the v8 will have more than adequate power to push it...and if you have looked at enough diffs, youll notice right away that it is a bit larger than the w123...

the 300D will have the same diff, just numerically lower (taller) gears...201 and late model diffs wont bolt up, it may be possible to modify a later 126 rear subframe to fit the 123, and then the later 126 diff will work(let me know if you do that!) you can also swap the guts of the same size diffs around, but youll likely need a shop to set it up for you (apparently MB diffs are really difficult to set up properly w/o the right tools... im still gonna try it anyway)


W123 Mods: 4 speed ** manual climate control ** '85 Kalitucky intake ** manual windows & full tint ** Euro headlights retrofit w/bixenon projectors ** 4 brake light mod ** Vogtland 50mm drop front & Lesjofors S600 drop rear springs ** 16" rims ** late w126 brake spindles, rotors & calipers ** full suspension rehab ** Bilstein HDs ** AL129X alternator & 1/0 starter and charging cables ** 300GD clutch/flywheel ** AFCO 80103N radiator & Earl's 41610 oil cooler ** custom block-off plate, remote oil filter & t-stat ** MW IP w/ tomnik's 6.5mm 'Holly' elements **

S124 Mods: 400E Rear subframe ** SL600 Brakes ** Late 300E 210mm diff ** SLK230 6 speed ** 17" CLK rims ** Vented RF Fender ** Facelift Hood, Headlights, and Lower Cladding **

OBK# 62

2.5-10
Nothing Clever

67
06-26-2009, 09:54 AM #7
I knew the W126 gasser diffs were 210mm sets, I was just unclear if the 85 and earlier were actually different mounting. good to know if and when I blow up the diff.

do I stll use the W115 axles with the 201mm diff?
also, does anyone know if the motor mount spacing in the W114/W115 is the same as the W123?
This post was last modified: 06-26-2009, 10:20 AM by 2.5-10.

1976 W115 medium red/tan 240D (undergoing M117 heart transplant)
1989 BMW E30 327iC SETA 5MT
1987 white/black 190D Turbo Diesel - Recaro 16V seats, Monoblocks, 11PSI.
2009 white/black C63 ///AMG
1987 BMW E30 325E M50B25NV 24V swap 5MT. 5 lug.
1999 white/grey ML430
1991 BMW E30 318i 5MT (Beater)
1990 BMW E34 525i 5MT
1997 red/black/black SL600
2.5-10
06-26-2009, 09:54 AM #7

I knew the W126 gasser diffs were 210mm sets, I was just unclear if the 85 and earlier were actually different mounting. good to know if and when I blow up the diff.

do I stll use the W115 axles with the 201mm diff?


also, does anyone know if the motor mount spacing in the W114/W115 is the same as the W123?


1976 W115 medium red/tan 240D (undergoing M117 heart transplant)
1989 BMW E30 327iC SETA 5MT
1987 white/black 190D Turbo Diesel - Recaro 16V seats, Monoblocks, 11PSI.
2009 white/black C63 ///AMG
1987 BMW E30 325E M50B25NV 24V swap 5MT. 5 lug.
1999 white/grey ML430
1991 BMW E30 318i 5MT (Beater)
1990 BMW E34 525i 5MT
1997 red/black/black SL600

DeliveryValve
Superturbo

1,338
06-26-2009, 02:56 PM #8
Yes use the w115 axles. Just make sure you have the correct spacer in the diff.

You have many other options besides the 123 or 126 if you can find one that suites your needs. Any differential from a 107, 114, 115, 116, 123 and 126 would swap, up to 9/85.

Gota love Mercedes Diesels!



.
DeliveryValve
06-26-2009, 02:56 PM #8

Yes use the w115 axles. Just make sure you have the correct spacer in the diff.

You have many other options besides the 123 or 126 if you can find one that suites your needs. Any differential from a 107, 114, 115, 116, 123 and 126 would swap, up to 9/85.


Gota love Mercedes Diesels!



.

SurfRodder
Jackass Extraordinaire

611
06-27-2009, 01:49 PM #9
(06-26-2009, 02:56 PM)DeliveryValve Any differential from a 107, 114, 115, 116, 123 and 126 would swap, up to 9/85.

thats really good to know... which ones of those had the 210mm gear? i wanna keep an eye out for certain ratios...

(06-26-2009, 02:56 PM)2.5-10 also, does anyone know if the motor mount spacing in the W114/W115 is the same as the W123?

im not sure... someone else prolly does.
This post was last modified: 06-27-2009, 01:51 PM by SurfRodder.

W123 Mods: 4 speed ** manual climate control ** '85 Kalitucky intake ** manual windows & full tint ** Euro headlights retrofit w/bixenon projectors ** 4 brake light mod ** Vogtland 50mm drop front & Lesjofors S600 drop rear springs ** 16" rims ** late w126 brake spindles, rotors & calipers ** full suspension rehab ** Bilstein HDs ** AL129X alternator & 1/0 starter and charging cables ** 300GD clutch/flywheel ** AFCO 80103N radiator & Earl's 41610 oil cooler ** custom block-off plate, remote oil filter & t-stat ** MW IP w/ tomnik's 6.5mm 'Holly' elements **

S124 Mods: 400E Rear subframe ** SL600 Brakes ** Late 300E 210mm diff ** SLK230 6 speed ** 17" CLK rims ** Vented RF Fender ** Facelift Hood, Headlights, and Lower Cladding **

OBK# 62
SurfRodder
06-27-2009, 01:49 PM #9

(06-26-2009, 02:56 PM)DeliveryValve Any differential from a 107, 114, 115, 116, 123 and 126 would swap, up to 9/85.

thats really good to know... which ones of those had the 210mm gear? i wanna keep an eye out for certain ratios...

(06-26-2009, 02:56 PM)2.5-10 also, does anyone know if the motor mount spacing in the W114/W115 is the same as the W123?

im not sure... someone else prolly does.


W123 Mods: 4 speed ** manual climate control ** '85 Kalitucky intake ** manual windows & full tint ** Euro headlights retrofit w/bixenon projectors ** 4 brake light mod ** Vogtland 50mm drop front & Lesjofors S600 drop rear springs ** 16" rims ** late w126 brake spindles, rotors & calipers ** full suspension rehab ** Bilstein HDs ** AL129X alternator & 1/0 starter and charging cables ** 300GD clutch/flywheel ** AFCO 80103N radiator & Earl's 41610 oil cooler ** custom block-off plate, remote oil filter & t-stat ** MW IP w/ tomnik's 6.5mm 'Holly' elements **

S124 Mods: 400E Rear subframe ** SL600 Brakes ** Late 300E 210mm diff ** SLK230 6 speed ** 17" CLK rims ** Vented RF Fender ** Facelift Hood, Headlights, and Lower Cladding **

OBK# 62

2.5-10
Nothing Clever

67
06-28-2009, 01:52 PM #10
(06-26-2009, 02:56 PM)DeliveryValve Yes use the w115 axles. Just make sure you have the correct spacer in the diff.

You have many other options besides the 123 or 126 if you can find one that suites your needs. Any differential from a 107, 114, 115, 116, 123 and 126 would swap, up to 9/85.

good to know, hopefully we wont blow the gear set on the 185mm diff that quickSmile
(06-27-2009, 01:49 PM)SurfRodder
(06-26-2009, 02:56 PM)DeliveryValve Any differential from a 107, 114, 115, 116, 123 and 126 would swap, up to 9/85.

thats really good to know... which ones of those had the 210mm gear? i wanna keep an eye out for certain ratios...

(06-26-2009, 02:56 PM)2.5-10 also, does anyone know if the motor mount spacing in the W114/W115 is the same as the W123?

im not sure... someone else prolly does.

I would think only the V8 versions of those chassis would have the 210mm gears.

and I'll hope that someone will chime in on the motor mount spacing Wink
This post was last modified: 06-28-2009, 01:53 PM by 2.5-10.

1976 W115 medium red/tan 240D (undergoing M117 heart transplant)
1989 BMW E30 327iC SETA 5MT
1987 white/black 190D Turbo Diesel - Recaro 16V seats, Monoblocks, 11PSI.
2009 white/black C63 ///AMG
1987 BMW E30 325E M50B25NV 24V swap 5MT. 5 lug.
1999 white/grey ML430
1991 BMW E30 318i 5MT (Beater)
1990 BMW E34 525i 5MT
1997 red/black/black SL600
2.5-10
06-28-2009, 01:52 PM #10

(06-26-2009, 02:56 PM)DeliveryValve Yes use the w115 axles. Just make sure you have the correct spacer in the diff.

You have many other options besides the 123 or 126 if you can find one that suites your needs. Any differential from a 107, 114, 115, 116, 123 and 126 would swap, up to 9/85.

good to know, hopefully we wont blow the gear set on the 185mm diff that quickSmile
(06-27-2009, 01:49 PM)SurfRodder
(06-26-2009, 02:56 PM)DeliveryValve Any differential from a 107, 114, 115, 116, 123 and 126 would swap, up to 9/85.

thats really good to know... which ones of those had the 210mm gear? i wanna keep an eye out for certain ratios...

(06-26-2009, 02:56 PM)2.5-10 also, does anyone know if the motor mount spacing in the W114/W115 is the same as the W123?

im not sure... someone else prolly does.

I would think only the V8 versions of those chassis would have the 210mm gears.

and I'll hope that someone will chime in on the motor mount spacing Wink


1976 W115 medium red/tan 240D (undergoing M117 heart transplant)
1989 BMW E30 327iC SETA 5MT
1987 white/black 190D Turbo Diesel - Recaro 16V seats, Monoblocks, 11PSI.
2009 white/black C63 ///AMG
1987 BMW E30 325E M50B25NV 24V swap 5MT. 5 lug.
1999 white/grey ML430
1991 BMW E30 318i 5MT (Beater)
1990 BMW E34 525i 5MT
1997 red/black/black SL600

GREASY_BEAST
Holset

411
06-28-2009, 03:02 PM #11
(06-26-2009, 09:48 AM)SurfRodder the 300D will have the same diff, just numerically lower (taller) gears...201 and late model diffs wont bolt up, it may be possible to modify a later 126 rear subframe to fit the 123, and then the later 126 diff will work(let me know if you do that!) you can also swap the guts of the same size diffs around, but youll likely need a shop to set it up for you (apparently MB diffs are really difficult to set up properly w/o the right tools... im still gonna try it anyway)

Pre-1985 V8 cars have a 2.47 diff that bolts to the W123 subframe. I know because I have one. All you have to do is swap the input shaft, or not if you are building a custom driveshaft.
This post was last modified: 06-28-2009, 03:03 PM by GREASY_BEAST.
GREASY_BEAST
06-28-2009, 03:02 PM #11

(06-26-2009, 09:48 AM)SurfRodder the 300D will have the same diff, just numerically lower (taller) gears...201 and late model diffs wont bolt up, it may be possible to modify a later 126 rear subframe to fit the 123, and then the later 126 diff will work(let me know if you do that!) you can also swap the guts of the same size diffs around, but youll likely need a shop to set it up for you (apparently MB diffs are really difficult to set up properly w/o the right tools... im still gonna try it anyway)

Pre-1985 V8 cars have a 2.47 diff that bolts to the W123 subframe. I know because I have one. All you have to do is swap the input shaft, or not if you are building a custom driveshaft.

2.5-10
Nothing Clever

67
06-28-2009, 05:17 PM #12
if I start with the 115 (123) diff, will I need to get a new custom drive shaft to mate up with the 85 or before V8 126 diff?

1976 W115 medium red/tan 240D (undergoing M117 heart transplant)
1989 BMW E30 327iC SETA 5MT
1987 white/black 190D Turbo Diesel - Recaro 16V seats, Monoblocks, 11PSI.
2009 white/black C63 ///AMG
1987 BMW E30 325E M50B25NV 24V swap 5MT. 5 lug.
1999 white/grey ML430
1991 BMW E30 318i 5MT (Beater)
1990 BMW E34 525i 5MT
1997 red/black/black SL600
2.5-10
06-28-2009, 05:17 PM #12

if I start with the 115 (123) diff, will I need to get a new custom drive shaft to mate up with the 85 or before V8 126 diff?


1976 W115 medium red/tan 240D (undergoing M117 heart transplant)
1989 BMW E30 327iC SETA 5MT
1987 white/black 190D Turbo Diesel - Recaro 16V seats, Monoblocks, 11PSI.
2009 white/black C63 ///AMG
1987 BMW E30 325E M50B25NV 24V swap 5MT. 5 lug.
1999 white/grey ML430
1991 BMW E30 318i 5MT (Beater)
1990 BMW E34 525i 5MT
1997 red/black/black SL600

DeliveryValve
Superturbo

1,338
06-28-2009, 06:35 PM #13
(06-28-2009, 01:52 PM)2.5-10
(06-27-2009, 01:49 PM)SurfRodder
(06-26-2009, 02:56 PM)DeliveryValve Any differential from a 107, 114, 115, 116, 123 and 126 would swap, up to 9/85.

thats really good to know... which ones of those had the 210mm gear? i wanna keep an eye out for certain ratios...

I would think only the V8 versions of those chassis would have the 210mm gears.

I would assume that is correct from 1972 and newer. The factory cut off point from the 185mm gear in a 1.1 liter case to the 210mm gear in a 1.3 liter case is at 200 horsepower. Everything with over 200 horsepower has the larger 210mm ring gear in the 1.3 liter case.



(06-28-2009, 05:17 PM)2.5-10 if I start with the 115 (123) diff, will I need to get a new custom drive shaft to mate up with the 85 or before V8 126 diff?

As stated earlier, you'll just need to change out the pinion/input flange that fits your driveshaft or make a custom shaft to fit the V8 126 style pinion/input flange.




.
This post was last modified: 06-28-2009, 06:37 PM by DeliveryValve.

Gota love Mercedes Diesels!



.
DeliveryValve
06-28-2009, 06:35 PM #13

(06-28-2009, 01:52 PM)2.5-10
(06-27-2009, 01:49 PM)SurfRodder
(06-26-2009, 02:56 PM)DeliveryValve Any differential from a 107, 114, 115, 116, 123 and 126 would swap, up to 9/85.

thats really good to know... which ones of those had the 210mm gear? i wanna keep an eye out for certain ratios...

I would think only the V8 versions of those chassis would have the 210mm gears.

I would assume that is correct from 1972 and newer. The factory cut off point from the 185mm gear in a 1.1 liter case to the 210mm gear in a 1.3 liter case is at 200 horsepower. Everything with over 200 horsepower has the larger 210mm ring gear in the 1.3 liter case.



(06-28-2009, 05:17 PM)2.5-10 if I start with the 115 (123) diff, will I need to get a new custom drive shaft to mate up with the 85 or before V8 126 diff?

As stated earlier, you'll just need to change out the pinion/input flange that fits your driveshaft or make a custom shaft to fit the V8 126 style pinion/input flange.




.


Gota love Mercedes Diesels!



.

2.5-10
Nothing Clever

67
07-15-2009, 09:56 AM #14
I just popped under the car, and I must say I am confused looking at the axles, the CV boots and mounts look very strange, hex bolts?

do they still pull straight out like they do on my toyota?

1976 W115 medium red/tan 240D (undergoing M117 heart transplant)
1989 BMW E30 327iC SETA 5MT
1987 white/black 190D Turbo Diesel - Recaro 16V seats, Monoblocks, 11PSI.
2009 white/black C63 ///AMG
1987 BMW E30 325E M50B25NV 24V swap 5MT. 5 lug.
1999 white/grey ML430
1991 BMW E30 318i 5MT (Beater)
1990 BMW E34 525i 5MT
1997 red/black/black SL600
2.5-10
07-15-2009, 09:56 AM #14

I just popped under the car, and I must say I am confused looking at the axles, the CV boots and mounts look very strange, hex bolts?

do they still pull straight out like they do on my toyota?


1976 W115 medium red/tan 240D (undergoing M117 heart transplant)
1989 BMW E30 327iC SETA 5MT
1987 white/black 190D Turbo Diesel - Recaro 16V seats, Monoblocks, 11PSI.
2009 white/black C63 ///AMG
1987 BMW E30 325E M50B25NV 24V swap 5MT. 5 lug.
1999 white/grey ML430
1991 BMW E30 318i 5MT (Beater)
1990 BMW E34 525i 5MT
1997 red/black/black SL600

SurfRodder
Jackass Extraordinaire

611
07-15-2009, 05:27 PM #15
are you referring to how to disconnect the axles? If so, you need to drain the diff and pop the back cover off. then you rotate the axles until you can see a C-clip, which will have a little ear that you can grab with some pliers and pull out. As for the outboard end, theres a standard hex bolt (10mm head, me thinks) that you need to take out.. then you should have enough wiggle room to get 'em out...

also note: before you remove the drain plug on the diff, ensure that you can fill it (remove the fill plug on top first)

W123 Mods: 4 speed ** manual climate control ** '85 Kalitucky intake ** manual windows & full tint ** Euro headlights retrofit w/bixenon projectors ** 4 brake light mod ** Vogtland 50mm drop front & Lesjofors S600 drop rear springs ** 16" rims ** late w126 brake spindles, rotors & calipers ** full suspension rehab ** Bilstein HDs ** AL129X alternator & 1/0 starter and charging cables ** 300GD clutch/flywheel ** AFCO 80103N radiator & Earl's 41610 oil cooler ** custom block-off plate, remote oil filter & t-stat ** MW IP w/ tomnik's 6.5mm 'Holly' elements **

S124 Mods: 400E Rear subframe ** SL600 Brakes ** Late 300E 210mm diff ** SLK230 6 speed ** 17" CLK rims ** Vented RF Fender ** Facelift Hood, Headlights, and Lower Cladding **

OBK# 62
SurfRodder
07-15-2009, 05:27 PM #15

are you referring to how to disconnect the axles? If so, you need to drain the diff and pop the back cover off. then you rotate the axles until you can see a C-clip, which will have a little ear that you can grab with some pliers and pull out. As for the outboard end, theres a standard hex bolt (10mm head, me thinks) that you need to take out.. then you should have enough wiggle room to get 'em out...

also note: before you remove the drain plug on the diff, ensure that you can fill it (remove the fill plug on top first)


W123 Mods: 4 speed ** manual climate control ** '85 Kalitucky intake ** manual windows & full tint ** Euro headlights retrofit w/bixenon projectors ** 4 brake light mod ** Vogtland 50mm drop front & Lesjofors S600 drop rear springs ** 16" rims ** late w126 brake spindles, rotors & calipers ** full suspension rehab ** Bilstein HDs ** AL129X alternator & 1/0 starter and charging cables ** 300GD clutch/flywheel ** AFCO 80103N radiator & Earl's 41610 oil cooler ** custom block-off plate, remote oil filter & t-stat ** MW IP w/ tomnik's 6.5mm 'Holly' elements **

S124 Mods: 400E Rear subframe ** SL600 Brakes ** Late 300E 210mm diff ** SLK230 6 speed ** 17" CLK rims ** Vented RF Fender ** Facelift Hood, Headlights, and Lower Cladding **

OBK# 62

winmutt
bitbanger

3,468
07-15-2009, 06:02 PM #16
13mm on the outside.

1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
OBK #42
winmutt
07-15-2009, 06:02 PM #16

13mm on the outside.


1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
OBK #42

2.5-10
Nothing Clever

67
07-15-2009, 11:14 PM #17
(07-15-2009, 05:27 PM)SurfRodder are you referring to how to disconnect the axles? If so, you need to drain the diff and pop the back cover off. then you rotate the axles until you can see a C-clip, which will have a little ear that you can grab with some pliers and pull out. As for the outboard end, theres a standard hex bolt (10mm head, me thinks) that you need to take out.. then you should have enough wiggle room to get 'em out...

also note: before you remove the drain plug on the diff, ensure that you can fill it (remove the fill plug on top first)

oh, wow - thats ridiculous! I'll just stick with my 183mm gearset Smile

560 motor is going in the /8 within the week.

(07-15-2009, 06:02 PM)winmutt 13mm on the outside.

hopefully I wont need to swap to a 210mm

1976 W115 medium red/tan 240D (undergoing M117 heart transplant)
1989 BMW E30 327iC SETA 5MT
1987 white/black 190D Turbo Diesel - Recaro 16V seats, Monoblocks, 11PSI.
2009 white/black C63 ///AMG
1987 BMW E30 325E M50B25NV 24V swap 5MT. 5 lug.
1999 white/grey ML430
1991 BMW E30 318i 5MT (Beater)
1990 BMW E34 525i 5MT
1997 red/black/black SL600
2.5-10
07-15-2009, 11:14 PM #17

(07-15-2009, 05:27 PM)SurfRodder are you referring to how to disconnect the axles? If so, you need to drain the diff and pop the back cover off. then you rotate the axles until you can see a C-clip, which will have a little ear that you can grab with some pliers and pull out. As for the outboard end, theres a standard hex bolt (10mm head, me thinks) that you need to take out.. then you should have enough wiggle room to get 'em out...

also note: before you remove the drain plug on the diff, ensure that you can fill it (remove the fill plug on top first)

oh, wow - thats ridiculous! I'll just stick with my 183mm gearset Smile

560 motor is going in the /8 within the week.

(07-15-2009, 06:02 PM)winmutt 13mm on the outside.

hopefully I wont need to swap to a 210mm


1976 W115 medium red/tan 240D (undergoing M117 heart transplant)
1989 BMW E30 327iC SETA 5MT
1987 white/black 190D Turbo Diesel - Recaro 16V seats, Monoblocks, 11PSI.
2009 white/black C63 ///AMG
1987 BMW E30 325E M50B25NV 24V swap 5MT. 5 lug.
1999 white/grey ML430
1991 BMW E30 318i 5MT (Beater)
1990 BMW E34 525i 5MT
1997 red/black/black SL600

DeliveryValve
Superturbo

1,338
07-15-2009, 11:57 PM #18
(07-15-2009, 09:56 AM)2.5-10 I just popped under the car, and I must say I am confused looking at the axles, the CV boots and mounts look very strange, hex bolts?

do they still pull straight out like they do on my toyota?

I think what you are looking at is called an Annular Axle. This axles can be separated at the flange which is installed in the differential. You can tell by the cap/hex bolts by the inner joint.
   
The good thing about these axles is that you don't have to take the diff cover off to remove the axles.


The other axles that came on Mercedes before 1986 is called Homokinetic.
They are distinguished by having similar cans on the inner and outer sides.
   
You will have to remove the diff cover and get at the "C" clip to remove the axle.


Both Annular and Homokinetic axles are interchangeable.... as long as you have the flange part on the Annular axle.



Here is a pic from FI's differentials. The diff on the left has Annular Axles as noted by the flanges on the sides and the cover is still intact. The diff on the right used the Homokinetic axles. You can see he had to remove the cover to get the axles out.
[Image: attachment.php?aid=657]




.
This post was last modified: 07-16-2009, 01:39 AM by DeliveryValve.

Gota love Mercedes Diesels!



.
DeliveryValve
07-15-2009, 11:57 PM #18

(07-15-2009, 09:56 AM)2.5-10 I just popped under the car, and I must say I am confused looking at the axles, the CV boots and mounts look very strange, hex bolts?

do they still pull straight out like they do on my toyota?

I think what you are looking at is called an Annular Axle. This axles can be separated at the flange which is installed in the differential. You can tell by the cap/hex bolts by the inner joint.
   
The good thing about these axles is that you don't have to take the diff cover off to remove the axles.


The other axles that came on Mercedes before 1986 is called Homokinetic.
They are distinguished by having similar cans on the inner and outer sides.
   
You will have to remove the diff cover and get at the "C" clip to remove the axle.


Both Annular and Homokinetic axles are interchangeable.... as long as you have the flange part on the Annular axle.



Here is a pic from FI's differentials. The diff on the left has Annular Axles as noted by the flanges on the sides and the cover is still intact. The diff on the right used the Homokinetic axles. You can see he had to remove the cover to get the axles out.
[Image: attachment.php?aid=657]




.


Gota love Mercedes Diesels!



.

2.5-10
Nothing Clever

67
07-16-2009, 12:07 AM #19
my 560 has annular for sure which is no surprise as its post 86, I havent looked at my /8 but I would guess it has the other type.

if I were to ever need to upgrade to a 85 gasser diff from a 126, would I need to get a new drive shaft? is the diff. casing the same width on the 183, and the 210 gearsets?

could I use the /8 183mm axles with a 85 126 gasser diff? what about my custom driveshaft?

1976 W115 medium red/tan 240D (undergoing M117 heart transplant)
1989 BMW E30 327iC SETA 5MT
1987 white/black 190D Turbo Diesel - Recaro 16V seats, Monoblocks, 11PSI.
2009 white/black C63 ///AMG
1987 BMW E30 325E M50B25NV 24V swap 5MT. 5 lug.
1999 white/grey ML430
1991 BMW E30 318i 5MT (Beater)
1990 BMW E34 525i 5MT
1997 red/black/black SL600
2.5-10
07-16-2009, 12:07 AM #19

my 560 has annular for sure which is no surprise as its post 86, I havent looked at my /8 but I would guess it has the other type.

if I were to ever need to upgrade to a 85 gasser diff from a 126, would I need to get a new drive shaft? is the diff. casing the same width on the 183, and the 210 gearsets?

could I use the /8 183mm axles with a 85 126 gasser diff? what about my custom driveshaft?


1976 W115 medium red/tan 240D (undergoing M117 heart transplant)
1989 BMW E30 327iC SETA 5MT
1987 white/black 190D Turbo Diesel - Recaro 16V seats, Monoblocks, 11PSI.
2009 white/black C63 ///AMG
1987 BMW E30 325E M50B25NV 24V swap 5MT. 5 lug.
1999 white/grey ML430
1991 BMW E30 318i 5MT (Beater)
1990 BMW E34 525i 5MT
1997 red/black/black SL600

SurfRodder
Jackass Extraordinaire

611
07-16-2009, 01:15 AM #20
(07-16-2009, 12:07 AM)2.5-10 if I were to ever need to upgrade to a 85 gasser diff from a 126, would I need to get a new drive shaft? is the diff. casing the same width on the 183, and the 210 gearsets?
no, but you would need to swap input flanges on the diff in that case
yes, the 185 and 210mm diff casings are same width

(07-16-2009, 12:07 AM)2.5-10 could I use the /8 183mm axles with a 85 126 gasser diff? what about my custom driveshaft?
the axles that came with the car you are putting the diff into should be what you need...
what custom driveshaft? /specs?

W123 Mods: 4 speed ** manual climate control ** '85 Kalitucky intake ** manual windows & full tint ** Euro headlights retrofit w/bixenon projectors ** 4 brake light mod ** Vogtland 50mm drop front & Lesjofors S600 drop rear springs ** 16" rims ** late w126 brake spindles, rotors & calipers ** full suspension rehab ** Bilstein HDs ** AL129X alternator & 1/0 starter and charging cables ** 300GD clutch/flywheel ** AFCO 80103N radiator & Earl's 41610 oil cooler ** custom block-off plate, remote oil filter & t-stat ** MW IP w/ tomnik's 6.5mm 'Holly' elements **

S124 Mods: 400E Rear subframe ** SL600 Brakes ** Late 300E 210mm diff ** SLK230 6 speed ** 17" CLK rims ** Vented RF Fender ** Facelift Hood, Headlights, and Lower Cladding **

OBK# 62
SurfRodder
07-16-2009, 01:15 AM #20

(07-16-2009, 12:07 AM)2.5-10 if I were to ever need to upgrade to a 85 gasser diff from a 126, would I need to get a new drive shaft? is the diff. casing the same width on the 183, and the 210 gearsets?
no, but you would need to swap input flanges on the diff in that case
yes, the 185 and 210mm diff casings are same width

(07-16-2009, 12:07 AM)2.5-10 could I use the /8 183mm axles with a 85 126 gasser diff? what about my custom driveshaft?
the axles that came with the car you are putting the diff into should be what you need...
what custom driveshaft? /specs?


W123 Mods: 4 speed ** manual climate control ** '85 Kalitucky intake ** manual windows & full tint ** Euro headlights retrofit w/bixenon projectors ** 4 brake light mod ** Vogtland 50mm drop front & Lesjofors S600 drop rear springs ** 16" rims ** late w126 brake spindles, rotors & calipers ** full suspension rehab ** Bilstein HDs ** AL129X alternator & 1/0 starter and charging cables ** 300GD clutch/flywheel ** AFCO 80103N radiator & Earl's 41610 oil cooler ** custom block-off plate, remote oil filter & t-stat ** MW IP w/ tomnik's 6.5mm 'Holly' elements **

S124 Mods: 400E Rear subframe ** SL600 Brakes ** Late 300E 210mm diff ** SLK230 6 speed ** 17" CLK rims ** Vented RF Fender ** Facelift Hood, Headlights, and Lower Cladding **

OBK# 62

2.5-10
Nothing Clever

67
07-16-2009, 09:21 AM #21
(07-16-2009, 01:15 AM)SurfRodder
(07-16-2009, 12:07 AM)2.5-10 if I were to ever need to upgrade to a 85 gasser diff from a 126, would I need to get a new drive shaft? is the diff. casing the same width on the 183, and the 210 gearsets?
no, but you would need to swap input flanges on the diff in that case
yes, the 185 and 210mm diff casings are same width

input flange is different on the 183mm diff than it is in the 85 gasser diff? do swap that, I would assume I would have to partiall disassemble both differentials correct?

(07-16-2009, 12:07 AM)2.5-10 could I use the /8 183mm axles with a 85 126 gasser diff? what about my custom driveshaft?
the axles that came with the car you are putting the diff into should be what you need...
what custom driveshaft? /specs?

I see, I just would hate to have to spend more $$ to get my already expensive drive shaft shortened or lengthened, since the 722.350 transmission is a bit bigger than the 4-speed manual

i sure hope the oil pan on the M117 clears the subframe on the /8

1976 W115 medium red/tan 240D (undergoing M117 heart transplant)
1989 BMW E30 327iC SETA 5MT
1987 white/black 190D Turbo Diesel - Recaro 16V seats, Monoblocks, 11PSI.
2009 white/black C63 ///AMG
1987 BMW E30 325E M50B25NV 24V swap 5MT. 5 lug.
1999 white/grey ML430
1991 BMW E30 318i 5MT (Beater)
1990 BMW E34 525i 5MT
1997 red/black/black SL600
2.5-10
07-16-2009, 09:21 AM #21

(07-16-2009, 01:15 AM)SurfRodder
(07-16-2009, 12:07 AM)2.5-10 if I were to ever need to upgrade to a 85 gasser diff from a 126, would I need to get a new drive shaft? is the diff. casing the same width on the 183, and the 210 gearsets?
no, but you would need to swap input flanges on the diff in that case
yes, the 185 and 210mm diff casings are same width

input flange is different on the 183mm diff than it is in the 85 gasser diff? do swap that, I would assume I would have to partiall disassemble both differentials correct?

(07-16-2009, 12:07 AM)2.5-10 could I use the /8 183mm axles with a 85 126 gasser diff? what about my custom driveshaft?
the axles that came with the car you are putting the diff into should be what you need...
what custom driveshaft? /specs?

I see, I just would hate to have to spend more $$ to get my already expensive drive shaft shortened or lengthened, since the 722.350 transmission is a bit bigger than the 4-speed manual

i sure hope the oil pan on the M117 clears the subframe on the /8


1976 W115 medium red/tan 240D (undergoing M117 heart transplant)
1989 BMW E30 327iC SETA 5MT
1987 white/black 190D Turbo Diesel - Recaro 16V seats, Monoblocks, 11PSI.
2009 white/black C63 ///AMG
1987 BMW E30 325E M50B25NV 24V swap 5MT. 5 lug.
1999 white/grey ML430
1991 BMW E30 318i 5MT (Beater)
1990 BMW E34 525i 5MT
1997 red/black/black SL600

DeliveryValve
Superturbo

1,338
07-16-2009, 04:23 PM #22
(07-16-2009, 12:07 AM)2.5-10 ....
if I were to ever need to upgrade to a 85 gasser diff from a 126, would I need to get a new drive shaft? .... what about my custom driveshaft?

If your going to make a custom driveshaft, I would keep the 126 gasser diff flange because it is stronger.



.

Gota love Mercedes Diesels!



.
DeliveryValve
07-16-2009, 04:23 PM #22

(07-16-2009, 12:07 AM)2.5-10 ....
if I were to ever need to upgrade to a 85 gasser diff from a 126, would I need to get a new drive shaft? .... what about my custom driveshaft?

If your going to make a custom driveshaft, I would keep the 126 gasser diff flange because it is stronger.



.


Gota love Mercedes Diesels!



.

2.5-10
Nothing Clever

67
07-16-2009, 05:14 PM #23
I'll be getting one made if I cant find a MB one that fits properly, the flex discs are hardly any bigger on the 560, very weird

1976 W115 medium red/tan 240D (undergoing M117 heart transplant)
1989 BMW E30 327iC SETA 5MT
1987 white/black 190D Turbo Diesel - Recaro 16V seats, Monoblocks, 11PSI.
2009 white/black C63 ///AMG
1987 BMW E30 325E M50B25NV 24V swap 5MT. 5 lug.
1999 white/grey ML430
1991 BMW E30 318i 5MT (Beater)
1990 BMW E34 525i 5MT
1997 red/black/black SL600
2.5-10
07-16-2009, 05:14 PM #23

I'll be getting one made if I cant find a MB one that fits properly, the flex discs are hardly any bigger on the 560, very weird


1976 W115 medium red/tan 240D (undergoing M117 heart transplant)
1989 BMW E30 327iC SETA 5MT
1987 white/black 190D Turbo Diesel - Recaro 16V seats, Monoblocks, 11PSI.
2009 white/black C63 ///AMG
1987 BMW E30 325E M50B25NV 24V swap 5MT. 5 lug.
1999 white/grey ML430
1991 BMW E30 318i 5MT (Beater)
1990 BMW E34 525i 5MT
1997 red/black/black SL600

SurfRodder
Jackass Extraordinaire

611
07-21-2009, 02:27 AM #24
(07-16-2009, 05:14 PM)2.5-10 I'll be getting one made if I cant find a MB one that fits properly, the flex discs are hardly any bigger on the 560, very weird

yeah...just enough to screw up a perfect fit...

W123 Mods: 4 speed ** manual climate control ** '85 Kalitucky intake ** manual windows & full tint ** Euro headlights retrofit w/bixenon projectors ** 4 brake light mod ** Vogtland 50mm drop front & Lesjofors S600 drop rear springs ** 16" rims ** late w126 brake spindles, rotors & calipers ** full suspension rehab ** Bilstein HDs ** AL129X alternator & 1/0 starter and charging cables ** 300GD clutch/flywheel ** AFCO 80103N radiator & Earl's 41610 oil cooler ** custom block-off plate, remote oil filter & t-stat ** MW IP w/ tomnik's 6.5mm 'Holly' elements **

S124 Mods: 400E Rear subframe ** SL600 Brakes ** Late 300E 210mm diff ** SLK230 6 speed ** 17" CLK rims ** Vented RF Fender ** Facelift Hood, Headlights, and Lower Cladding **

OBK# 62
SurfRodder
07-21-2009, 02:27 AM #24

(07-16-2009, 05:14 PM)2.5-10 I'll be getting one made if I cant find a MB one that fits properly, the flex discs are hardly any bigger on the 560, very weird

yeah...just enough to screw up a perfect fit...


W123 Mods: 4 speed ** manual climate control ** '85 Kalitucky intake ** manual windows & full tint ** Euro headlights retrofit w/bixenon projectors ** 4 brake light mod ** Vogtland 50mm drop front & Lesjofors S600 drop rear springs ** 16" rims ** late w126 brake spindles, rotors & calipers ** full suspension rehab ** Bilstein HDs ** AL129X alternator & 1/0 starter and charging cables ** 300GD clutch/flywheel ** AFCO 80103N radiator & Earl's 41610 oil cooler ** custom block-off plate, remote oil filter & t-stat ** MW IP w/ tomnik's 6.5mm 'Holly' elements **

S124 Mods: 400E Rear subframe ** SL600 Brakes ** Late 300E 210mm diff ** SLK230 6 speed ** 17" CLK rims ** Vented RF Fender ** Facelift Hood, Headlights, and Lower Cladding **

OBK# 62

 
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