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Old 07-03-2019, 03:57 PM
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Diesel Engine Swap

Hey guys! Not sure if this is the correct spot for this question but hoping someone can lend some advice.

Recently swapped a OM617 engine from a 1985 Mercedes into my 1983 CJ7 with 33x12.50 tires. I didn't have the time and money for a Trans upgrade so as of right now it has the T5 in there. I'm still trying to figure out the gears that are in there right now, the Jeep was a project to say the least when I first got it and all info from previous owner was incorrect...

Anyways... The issue I am having is when I am changing from 3rd to 4th gear. I feel like I have to rev 3rd pretty high for a while to go into 4th. No matter what 4th bogs pretty bad and I have to play catch up. I keep getting in that "in between" issue where I'm running out of 3rd gear but 4th isn't there yet.

I know it's not great info but I am planning on figuring out what gears I have and getting a tach soon to figure out exactly where I'm at when cruising and shifting.

Any ideas?

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1983 CJ7 w/ OM617 Diesel Swap - 33x12.50 Tires - 4.5" Extreme Duty YJ Springs - Bilstein Shocks - A Bunch of Rattles & Vibrations
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Old 07-08-2019, 11:00 PM   #2
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Originally Posted by CJ617D View Post
Hey guys! Not sure if this is the correct spot for this question but hoping someone can lend some advice.

Recently swapped a OM617 engine from a 1985 Mercedes into my 1983 CJ7 with 33x12.50 tires. I didn't have the time and money for a Trans upgrade so as of right now it has the T5 in there. I'm still trying to figure out the gears that are in there right now, the Jeep was a project to say the least when I first got it and all info from previous owner was incorrect...

Anyways... The issue I am having is when I am changing from 3rd to 4th gear. I feel like I have to rev 3rd pretty high for a while to go into 4th. No matter what 4th bogs pretty bad and I have to play catch up. I keep getting in that "in between" issue where I'm running out of 3rd gear but 4th isn't there yet.

I know it's not great info but I am planning on figuring out what gears I have and getting a tach soon to figure out exactly where I'm at when cruising and shifting.

Any ideas?
Well you can get a good idea of the T5 gears via google.

I think you might want to take a look at that engine. Diesels are notorious for responding well to new governor springs, turbos, bigger injectors, etc.

A quick google of the stock power numbers for that engine and im not very impressed. I would look into some cheap quick upgrades for the engine to help it come to life. Its stock CR ratio was only 21:1 which seems kind of low for cylinder pressures by todays standards at least. (for a diesel engine)

Your Axles could also 2.73 gears too.

You should figure out what gears you have and good from there.

If you have a crazy highway gear I would adjust that first. If you are still not happy after that I would look at things for your engine.
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