AX15 w/ 4.2 vs 4.0 - Jeep Wrangler Forum

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Old 07-19-2013, 03:42 PM
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JerseyDriver's Avatar
Join Date: Jun 2013
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AX15 w/ 4.2 vs 4.0

I will be swapping out my AX15 this winter (my synchro's are shot). I have heard good things about the rebuilt tranny's on eBay where you send back your core.

Anyway, I currently have the 4.2 but I'm only a few years away from rebuilding or replacing that too. And once the time comes, I've been considering just swapping it with a rebuilt 4.0. (Haven't decided on that yet).

My question... If I put in the AX15 now on the 4.2, what challenges am I adding down the road when the time comes to put in the 4.0? I'm sure it's not much, but wanted to ask. I dont want to handcuff myself to the 4.2.

Replacing both the trans and the block together is financially out of the question.
'89 YJ Sahara
4" lift, sitting on 33's, winch, light bar
(hoping to do an 8.8 swap one of these days)
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Old 07-21-2013, 12:00 AM   #2
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Location: White Mtns. AZ
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Short answer, none, there both totally interchangeable.
Bombing for peace is like F*cking for virginity!
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