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Old 02-19-2009, 07:35 PM   #1
LBJ
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2.5 to 4.0 swap

Have a 95 yj with a 2.5 and auto. Want to switch to a 4.0 motor, Anyone done this and what do I need?

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Old 02-19-2009, 11:31 PM   #2
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Your easiest bet would be to find a motor from a 96 Cherokee. All of your gauges will work and if you can get a hold of the whole wiring harness it's "mostly" plug and play.

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Old 02-20-2009, 04:40 AM   #3
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Will the harness from the cherokee work on the wrangler? Will the trans from the 4cyl. bolt up to the 4.0?
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Old 02-20-2009, 06:26 AM   #4
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hey dave where are ya buddy??? here is another one!
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Old 02-20-2009, 06:47 AM   #5
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ur very best bet is try to find the same or similar year motor/tranny/tcase harness and computer....otherwise there will be splicing....
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Old 02-20-2009, 07:01 AM   #6
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Depending on how much you have invested in the current jeep, it might be better to sell it, and buy a YJ with the 4.0L and auto already in it.
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Old 02-20-2009, 04:32 PM   #7
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but it would be better to swap a 6 cylinder into a 4 cylinder jeep. being that a 4 cylinder has 4.11 gears in the axles as a 6 cylinder has 3.73. i have a 89 yj with a 2.5l which i'm picking up a 95 cherokee to swap it to a 4.0l. so if i remember to bring my camera when i do it i'll post a write-up on the swap. the major part of the swap is cutting the motor mounts and moving them forward.
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Old 02-23-2009, 05:28 PM   #8
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do you know if the trans from the 2.5 will bolt up to the 4.0? figured on finding a donor vehicle to swap the wiring and acessories. was going to put a reman motor in it when the 4cyl gets tired.
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Old 02-23-2009, 05:32 PM   #9
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do you know if the trans from the 2.5 will bolt up to the 4.0? figured on finding a donor vehicle to swap the wiring and acessories. was going to put a reman motor in it when the 4cyl gets tired.
i would run the aw4 tranny that is probably in the cherokee.....it is a medium duty tranny with a decently low first gear.....it is computer controlled but if yoyu have the whole cherokee then no problem...the 4 cyl tranny will not bolt to a 4.0l...i believe the input shaft is wrong
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Old 02-23-2009, 05:37 PM   #10
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hey dave where are ya buddy??? here is another one!
i love these threads.

here's a good read and laugh

http://www.wranglerforum.com/f8/inst...5-a-16925.html
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Old 02-25-2009, 01:49 PM   #11
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Maybe this will help:
Last year a friend of mine swapped his 94' over. He found a rusted out 94' with a 4.0/ax-15. with about 70,000 miles that ran well but was needed frame repair. He swapped everything over by himself in 2 weekends. he guess's about 35-40 hours total. He bought new motor mounts and welded them into place and after that plug and play. pretty straight forward. Eventually I plan on doing something but right now I am in the middle of restoring and swapping in a 350 TBI,700r4 in my 82' scrambler,so not on the top of my priority's.
but the reason I am mentioning this is for 35-40 hrs of labor you could swap in a v8 and be much more happy with the result.
Thats my 2 cents.
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Old 02-26-2009, 05:43 AM   #12
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I just did this over the weekend but with a frame swap instead of moving motor mounts due to some severe rot around the rear shakle mounts and me being too lazy/inexpierenced to weld. (though no beleives me.... Yet, pics to come) its a ton of work but we did it with 4 guys in 3 days. We didn't do anything else in those 3 days. In fact we barely stopped to eat. It you have the means and get a good deal I'd say its worth it.

I had a donor yj pile in my garage when we started so almost everything was right there for me to use.

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