Om617 96 Jeep Cherokee build thread - Page 39 - Diesel Bombers



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  #381  
Old 04-17-2017, 07:09 AM
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Originally Posted by Hillbilly1 View Post
I found this on the cars,
The 1985 does have a higher stall speed converter installed in from the factory.
'85 is around 2400 - 2700 RPMs and the previous years 1450 - 1650 RPMs.



.
Peak HP and TQ on these engines are 2400rpm, that is the sweet spot. I don't remember but I think the transmission gearing made up for the high rear end gears. Pay special attention to gearing and lockup or it will suck.
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  #382  
Old 04-17-2017, 08:39 AM
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Originally Posted by Hillbilly1 View Post
Will a 3000 be too high? Might as well get it right before I drop mine in. The transmission came out of an S10, so should be close to a 2000 stall from the factory. Right now I'm running stock tires and wheels, but a 4" lift kit is in the future before I drop the motor in, with the winch and heavy motor will probably work out to be around 2.5-3" and I belive my present axle is around a 3.75.

running my scout 800 with 3.75 was IMO in unacceptable but for low range or high range in 1st gear
also my 1984 300sd has a rear with 2.88
Trany gearing is according to MB
1st =3.68
2nd =2.41
3rd = 1.44
4th =1
R =5.14
its also running a lot smaller tiers 195/70R14


My 700R4 came from a K10 and was backed with a NP208 .
the TC was stalling at just under 3000 and frankly sucked when I backed it up to my 4.3 even though it was bored 60 over , balanced , ported and redline HP cam . while it would maintain speed in OD there was low power and high trany temps
I switched that TC out for a S10 TC that was behind a 4.3 , rated from factory at 2375. Trans temps went down considerably and much better performance on both street and trail .literally the 4.3 went from nice to throwing you back in the seat . If it wasn't for the crappy mileage it would have still been in there scout
so depending on what engine was in your S10 you may fine the TC isn't a 3000 . if it was a 4.3 or smaller its more then likely going to be in the 2400 range . give or take .

just my opinion but I don't think your going to like the 3.73 gearing with the OM617 even on the back roads and dirt unless you get the OM617 to produce like numbers for the engine that was in the S10 at the same RPMs.


as for myself if I can get the OM617 backed by the 700R4 to be alittle better then the IH 196 which originally came in my scout , ill be happy . while the 196 wasn't a power house , it was more the capable on and off road .


I have done a lot of engine swaps through the years even though this is my first diesel swap . basically IMO there are 2 ways to approach them . either try and duplicate the performance of the car the engine came from OR modify the engine to make or hopefully exceed the power that the drive train came from with like numbers . in other words modify the engine or modify the drive train

Last edited by Captchee; 04-17-2017 at 08:51 AM.
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  #383  
Old 04-17-2017, 10:05 AM
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Quote:
Originally Posted by Captchee View Post
running my scout 800 with 3.75 was IMO in unacceptable but for low range or high range in 1st gear
also my 1984 300sd has a rear with 2.88
Trany gearing is according to MB
1st =3.68
2nd =2.41
3rd = 1.44
4th =1
R =5.14
its also running a lot smaller tiers 195/70R14


My 700R4 came from a K10 and was backed with a NP208 .
the TC was stalling at just under 3000 and frankly sucked when I backed it up to my 4.3 even though it was bored 60 over , balanced , ported and redline HP cam . while it would maintain speed in OD there was low power and high trany temps
I switched that TC out for a S10 TC that was behind a 4.3 , rated from factory at 2375. Trans temps went down considerably and much better performance on both street and trail .literally the 4.3 went from nice to throwing you back in the seat . If it wasn't for the crappy mileage it would have still been in there scout
so depending on what engine was in your S10 you may fine the TC isn't a 3000 . if it was a 4.3 or smaller its more then likely going to be in the 2400 range . give or take .

just my opinion but I don't think your going to like the 3.73 gearing with the OM617 even on the back roads and dirt unless you get the OM617 to produce like numbers for the engine that was in the S10 at the same RPMs.


as for myself if I can get the OM617 backed by the 700R4 to be alittle better then the IH 196 which originally came in my scout , ill be happy . while the 196 wasn't a power house , it was more the capable on and off road .


I have done a lot of engine swaps through the years even though this is my first diesel swap . basically IMO there are 2 ways to approach them . either try and duplicate the performance of the car the engine came from OR modify the engine to make or hopefully exceed the power that the drive train came from with like numbers . in other words modify the engine or modify the drive train
I know mine is not a 3000 stall, I was just asking if it would be any better, according to what I have found, the S10 is a 2000 stall, so 2000-2400 is probably correct, so I'm going to stick with it. I'm using the transmission and 231c hd transfercase instead of the 231j, already installed a sye
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  #384  
Old 04-17-2017, 10:36 AM
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The Germans must have some steep driveways to back out of! LOL! 5.14! The 700r is a little higher though, but lower than the Jeeps three speed auto.
700R4 TRANSMISSION RATIOS
1st
2nd
3rd
4th
Reverse
3.059 : 1
1.625 : 1
1.00 : 1
0.696 : 1
2.294 : 1
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  #385  
Old 04-20-2017, 07:56 PM
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Gear Ratio Calculator

You might try this gear ratio calculator to see if it is of any help for you. Plug in transmission, transfer case, doublers (if you have one), tire size, and rear end gear ratio to see what vehicle speeds, RPM's, 4 X 4 low axle speeds are, etc. You can run two different scenarios side by side for comparing.

Don
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