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Old 03-26-2012, 06:11 PM   #1 (permalink)
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2.5L to Auto Tranny

Has anybody adapted 4.0L auto or GM auto to a 4cyl jeep motor? I hate the manual for crawling. I haven't been able to find any info on such a swap.

I have a 99 TJ with 60/14b, 5.13's in it, 38.5 SX's, D300 with 4:1's in it. I done it all myself and I am not opposed to having to regear again to run the auto as I can set-up my own gears. I have a rear 60 I can swap in to replace the 14b.

Any one done it or have any info on what needs to be done to do it?
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Old 03-26-2012, 06:45 PM   #2 (permalink)
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Some early '90s 2.5l XJ's came with the AW-4 as the auto transmission, 2wd and 4wd. The bellhousing from one of these will fit an AW-4 from a 4.0l. The TCM is different, too, gave a couple hundred RPMs higher shift point spread.
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Old 03-27-2012, 04:14 AM   #3 (permalink)
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Why not look at the 30RH? It came factory for your year and engine and would bolt right up. Its a 3 speed though if that matters.
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Old 03-27-2012, 05:34 AM   #4 (permalink)
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Why not look at the 30RH? It came factory for your year and engine and would bolt right up. Its a 3 speed though if that matters.
Agreed, your gear and tire combo would run at around 2900rpm at 65mph, I don't think a 2.5 could pull less rpm at that speed. The 32RH has a locking converter and a 2.74 first gear ratio, it is a good little trans and is much shorter overall than any Chevy you might adapt.
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Old 03-27-2012, 06:55 PM   #5 (permalink)
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Originally Posted by Greg Ducato View Post
Agreed, your gear and tire combo would run at around 2900rpm at 65mph, I don't think a 2.5 could pull less rpm at that speed. The 32RH has a locking converter and a 2.74 first gear ratio, it is a good little trans and is much shorter overall than any Chevy you might adapt.
I don't think I'll be hitting 65 anytime soon...LOL. I don't drive on the highway much at all. Most of our wheeling spots are within city limits so 40-50mph is all I will see. I am just sick of riding the clutch when crawling.

What else would I need? Would I need to change out the ECU to accomodate the auto? Tranny's are like voodoo to me
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Old 03-28-2012, 04:21 AM   #6 (permalink)
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Trans, trans cooler, shifter, ecu - might need to change the input shaft on your tcase. Driveshaft lengths will change.
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