Plenty of articles show up if you Google "jeep swap 2.5 for 4.0" but if none of them have what you're looking for then you might want to go into more detail so you can get the answers you're looking for.
I thought about going that route when I had my YJ, but when I was researching it all the info. I found showed me that it would cost as much if not more and involve about the same work as if I went ahead and dropped a V-8 in it. Are you wanting to replace the entire drive train or just the engine and keep the transmission/transfer case from the 4 banger?
Me personally, if I was going to swap to a different motor than what the Jeep came with I would go ahead and put a Chevy 350 in it.
So either way you will modify engine mounts, have to change transmission, change or modify transfer case and any other odds and ends such as fuel pump, computer wiring, etc. Some of the things may work out great with the 2.5 to 4.0 swap, just from what I found it didn't seem like a simple relocate mounts, bolt up and go swap.
Currently my Jeep has the 4.0 in it and I am happy with it. Great engine and I don't really plan on swapping it out for a V-8. But I do love the sound, power and torque of the V-8.
Not trying to get in an argument over which is better. To me both are great engines, just IMO I would go with the V-8 if I was making the changes, but I know that everyone doesn't want the V-8 and would rather keep the Jeep more stock.
i just did one about a month ago for a friend of mine. he had a four cylinder yj with a blown endine and a six cylinder with a bad frame.
i took the six out with the harness and trans and reused the four cylinder t case by switching the input gear ( didnt want to use the six case because the 4cyl case already had a s.y.e. .
cut the six cyl frame mounts off of the original frame and welded them into the four cylinder frame.
the wiring harness was the easiest part of the whole deal.
if you have the donor vehicle it is a super easy swap and took me less than two days worknig by myself.
Guys your awesome.Tx for replies because its helped alot.I do want to stick with the 4.0.Had an XJ and loved that engine.Would be great to have that XJ back now but traded it for this YJ.Thanks again for replies.
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