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+--- Thread: Om617 trans ratio question (/showthread.php?tid=7332)
Om617 trans ratio question - carlitosgy6 - 07-31-2016
Hey im trying to do some calculations to set the rear gears on my grand cherokee Om617, im positive it nedds higher number on the rear but for that i just need one more piece of info and is if the converter has a clutch on it, i looked that the om617 transmission has a 3.54 first and a 1to1 4 fourth gear, i will be thankful to verify this info and to know about the converter lock up
RE: Om617 trans ratio question - EmJay - 07-31-2016
Are you 2wd or 4? Yes I believe that the 722.3 and 722.4 have a 1:1 ratio. Unsure if I remember right but I think it's 3.68:1, 2.44:1, 1.41:1, 1:1
RE: Om617 trans ratio question - carlitosgy6 - 08-01-2016
Is a two wheel drive with the same weight of a 300sd 3900 pounds, the transmission is a aw4 from a Cherokee qith a. 75 overdrive thats is having 1600 rpm at 55 but my calculations tells me that a 300sd has on its final gear around 2250 rpm, but if the tras doesn't have a converter clutch i will have to add probably around 200 rpm on 55,where im sitting now seems that i need a 4.56 against what I have now 3.55
RE: Om617 trans ratio question - EmJay - 08-01-2016
So, you aren't running the transmission that came with the 617? (That would be the 722.3)
RE: Om617 trans ratio question - Evenglass - 08-04-2016
I believe your logic is correct. I have 4.56 in my Jeep Cherokee. May be some good info for you in my build.
http://www.dieselbombers.com/diesel-engine-conversions/118649-om617-96-jeep-cherokee-build-thread.html
RE: Om617 trans ratio question - carlitosgy6 - 10-30-2016
I installed the 4.56 it worked great but i removed it because it was having poor mpg compared to the 3.55,i know i will loose some but was too much, i installed a 3.73 runs a lot better than my 3.55 but with good mileage, just an update
RE: Om617 trans ratio question - Evenglass - 10-30-2016
(10-30-2016, 07:54 PM)carlitosgy6 I installed the 4.56 it worked great but i removed it because it was having poor mpg compared to the 3.55,i know i will loose some but was too much, i installed a 3.73 runs a lot better than my 3.55 but with good mileage, just an updateThank you for the update. I use this Jeep heavily offroad but it is also my daily driver. I'm running 32.4" tires. I gained about 2mpg when I wired the torque converter lockup. I'm getting 17mpg around town I'd guess about 20mpg on the highway, my Jeep is getting pretty heavy with all the crap I keep adding.
RE: Om617 trans ratio question - Evenglass - 10-30-2016
What kind of milage are you getting? And what were you getting with the 4.56? Lift? Converter lockup? Tires?