Stronger automatic trannies?
Stronger automatic trannies?
I was wondering if there were any high performance rebuild kits or tricks available to improve the lifespan and performance of the auto trannies. I know the race spec 700R4 was by far the biggest seat of the pants improvement to my camaros performance. But it included a full high performance rebuild with heavy duty clutch packs, a corvette 1st to 2nd servo, a stage II shift kit, and a 2600rpm stall converter with a kevlar luckup clutch. What is the designation for these transmissions, and what companies (probably in germany or something) sell performance parts for them?
thanks
Hello all, I was wondering about the automatic transmissions in the 300CD cars in particular and the turbo diesel mercedes in general.
I was wondering if there were any high performance rebuild kits or tricks available to improve the lifespan and performance of the auto trannies. I know the race spec 700R4 was by far the biggest seat of the pants improvement to my camaros performance. But it included a full high performance rebuild with heavy duty clutch packs, a corvette 1st to 2nd servo, a stage II shift kit, and a 2600rpm stall converter with a kevlar luckup clutch. What is the designation for these transmissions, and what companies (probably in germany or something) sell performance parts for them?
thanks
1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
OBK #42
You should be able to increase the modulator pressure to account for increased power. Otherwise the options are pretty limited. This same transmission was used in Porches, so it has to be pretty decent. Remember transmissions and what not are rated by torque not HP.
1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
OBK #42
The 722.x series are amazing transmissions. They were introduced in 1970 as the 722.0 and are still in use as the 722.6 in every MB and several Dodge and Chryslers. New MBs use the 722.9 7-speed.
ForcedInduction
08-09-2008, 05:26 AM
#3
Supposedly the clutch packs from the 722.3 or 722.6 used on the 600 series (V12) can be swapped into the stock transmission without any electronic controls. The 6.0L V12 M120 put out 400-428 lb/ft of torque.
The 722.x series are amazing transmissions. They were introduced in 1970 as the 722.0 and are still in use as the 722.6 in every MB and several Dodge and Chryslers. New MBs use the 722.9 7-speed.
Quote:722.6Â’s modified to handle over 800HP!
Improved clutches/oiling/pumps makes a substantial increase in power handling possible.
We can also adapt a .6 to your earlier 4sp (722.3) Mercedes with a stand alone controller. Add a 5th gear for economy and have the above modification for added power handling capacity.
Please call to discuss your needs/wants/pricing.
(404) 805-1357
GREASY_BEAST
08-27-2008, 09:29 PM #4Found at blueridgemb.com:
Quote:722.6Â’s modified to handle over 800HP!
Improved clutches/oiling/pumps makes a substantial increase in power handling possible.
We can also adapt a .6 to your earlier 4sp (722.3) Mercedes with a stand alone controller. Add a 5th gear for economy and have the above modification for added power handling capacity.
Please call to discuss your needs/wants/pricing.
(404) 805-1357
winmutt What is the 722.6 from?I believe it is the one used in my CDI. Hence the standalone controller comment... My guess is that controller would be pretty pricey. Then again, so would modifying the transmission (and building an engine) to handle 800HP!!
John Robbins
'05 E320 CDI - 118k - Faaaaaast!!
'87 300TD - 317k - Cracked head... but an OM606 is on the way!
'79 300SD - 295k - Bad engine = project car!
winmutt What is the 722.6 from?I believe it is the one used in my CDI. Hence the standalone controller comment... My guess is that controller would be pretty pricey. Then again, so would modifying the transmission (and building an engine) to handle 800HP!!
John Robbins
'05 E320 CDI - 118k - Faaaaaast!!
'87 300TD - 317k - Cracked head... but an OM606 is on the way!
'79 300SD - 295k - Bad engine = project car!
<!-- m --><a class="postlink" href="http://www.blueridgemb.com/">http://www.blueridgemb.com/</a><!-- m -->
I wouldn't expect such a modification to be low cost. It would be up there with a Myna pump.
ForcedInduction
08-29-2008, 04:33 AM
#7
Here is their website.
<!-- m --><a class="postlink" href="http://www.blueridgemb.com/">http://www.blueridgemb.com/</a><!-- m -->
I wouldn't expect such a modification to be low cost. It would be up there with a Myna pump.
GREASY_BEAST
09-01-2008, 06:46 AM #8all things considered, if it cost the same as a myna pump, I would do this mod over getting a myna pump.... and then get a myna pump.... oh if only my disposable income match my ambitions..
ForcedInduction
09-01-2008, 07:53 PM
#9
Yes, get the transmission first. There are many other power adders (VNT turbo, intercooler, W/M injection, propane, etc) that can bring torque up to the limit. No point in getting a power pump first if you can't use it!
Lincolnlock
10-24-2008, 10:23 AM #10What can we do to our stock transmissions to get some more holding power? I've already adjusted the vacuum regulator down to quickin the shifts. I'm pretty sure it's at it's limit right now and I haven't even touched the internal pump settings yet.
Lincolnlock What can we do to our stock transmissions to get some more holding power?You can increase the modulator pressure. How, I don't know. Maybe somebody that does (KTA-Cummins) will speak up.
I hear the later 722.6 guts can be used to rebuild the 722.3 so it can handle extreme power. The 722.6 was used behind the M120 V12 and takes upwards of 400ft/lbs of torque!
ForcedInduction
11-30-2008, 10:04 AM
#11
Lincolnlock What can we do to our stock transmissions to get some more holding power?You can increase the modulator pressure. How, I don't know. Maybe somebody that does (KTA-Cummins) will speak up.
I hear the later 722.6 guts can be used to rebuild the 722.3 so it can handle extreme power. The 722.6 was used behind the M120 V12 and takes upwards of 400ft/lbs of torque!
<!-- m --><a class="postlink" href="http://www.mercedesdismantlers.com/722.118_transmission_adjustments.html">http://www.mercedesdismantlers.com/722. ... ments.html</a><!-- m -->
I don't know if there is a similar thing on 300D transmissions or not. It seems like it would be located somewhere near where the bowden cable meets the tranny, but who knows... can't tell from the damn picture what the hell he is adjusting!!
EDIT: Disregard the previous nonsense. Wrong transmission. Here is the right one:
<!-- m --><a class="postlink" href="http://www.mercedesdismantlers.com/722.3and722.416_transmission_adjustments.html">http://www.mercedesdismantlers.com/722. ... ments.html</a><!-- m -->
and the adjustment appears to be located where the vacuum tube meets the transmission!
GREASY_BEAST
12-01-2008, 11:26 PM #12found this
<!-- m --><a class="postlink" href="http://www.mercedesdismantlers.com/722.118_transmission_adjustments.html">http://www.mercedesdismantlers.com/722. ... ments.html</a><!-- m -->
I don't know if there is a similar thing on 300D transmissions or not. It seems like it would be located somewhere near where the bowden cable meets the tranny, but who knows... can't tell from the damn picture what the hell he is adjusting!!
EDIT: Disregard the previous nonsense. Wrong transmission. Here is the right one:
<!-- m --><a class="postlink" href="http://www.mercedesdismantlers.com/722.3and722.416_transmission_adjustments.html">http://www.mercedesdismantlers.com/722. ... ments.html</a><!-- m -->
and the adjustment appears to be located where the vacuum tube meets the transmission!
Section106
12-23-2008, 12:39 AM #13Has anyone ever mated a 727 TorqueFlite or LoadFlite to a Super Turbo Mercedes engine? The Load Flites are used with the Cummins 5.9L from the factory.
maybe a bell housing modification would be easier... but if the internals are laid out the same/similar, it might be the way to go.
plus it just so happens that I have a .3 assembly thats completely toast that I could gut for the hell of it...
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
05-27-2009, 09:34 AM #14Is there a way to fit the guts of a 722.9 into a .3? That would be the way to go.. then you could run a 3.07 rear and still have good topend... from a first gear ratio of 13.44:1 to a 7th speed of 2.23:1...that would be pretty sweet...
maybe a bell housing modification would be easier... but if the internals are laid out the same/similar, it might be the way to go.
plus it just so happens that I have a .3 assembly thats completely toast that I could gut for the hell of it...
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
plus the dot 9 is magnesium bell housing.
1979 450SEL 6.9 - stock
1960 220SE
111 tube chassis car/undergoing full restoration. Body work in progress. Merging with a 1996 S500 (119 engine, 722.6 trans, and both subframes)
2005 S55 AMG - stock
1999 SLK230 Kompressor - stock
2006 SLK55 AMG - stock
I highly doubt dot 9 guts would fit in a dot 3 mainly because the shift member bolt patterns and the front pump are different.
plus the dot 9 is magnesium bell housing.
1979 450SEL 6.9 - stock
1960 220SE
111 tube chassis car/undergoing full restoration. Body work in progress. Merging with a 1996 S500 (119 engine, 722.6 trans, and both subframes)
2005 S55 AMG - stock
1999 SLK230 Kompressor - stock
2006 SLK55 AMG - stock
![[Image: image007.jpg]](http://www.center-at.ru/files/akpp/image007.jpg)
I wouldn't mind finding a 5-speed auto and getting a cheap standalone computer for it. It would probably be cheaper than a 5-speed manual.
ForcedInduction
05-27-2009, 12:58 PM
#16
No way you could get a 7-speed inside a 3-speed housing. The 722.9 is a monster.
I wouldn't mind finding a 5-speed auto and getting a cheap standalone computer for it. It would probably be cheaper than a 5-speed manual.
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