4.0L engines that I CAN'T use?

Question

Okay, I've done all my research and I am finally ready to transplant the 258 in my 87 YJ with a 4.0L. I've already got an AX-15 in it, so I just need the motor.

My question is: Are there any 4.0L engines that will NOT work for me? I know that the comp and flywheel have to come from a manual donor, but other than that my understanding is that ANY Jeep 4.0L will do. All the way up to

2003.

I'm sure some stuff like exhaust or the air box may not fit if it comes from a non-Wrangler. I'm just looking for any major showstoppers or gotchas I may run in to if I end up getting the motor out of a Grand Cherokee or a 2001 TJ or something.

Your advice is greatly appreciated.

Ryan VanMiddlesworth

L.W.(ßill) · Accepted Answer

There are pilot bearing differences, but if the AX-15 came form a4.0 they should be the same.         God Bless America, ßill O|||||||Omailto:      wrote:

Will Honea · Answer

That would be the only difference I could see, too.  Be careful about the pilot - they also made an AX15 with a cut down pilot shaft to fit the smaller BA10/5 size pilot bushing (which I couldn't find anywhere locally).  Either way, you can get a pilot to fit.  If it's the cut down shaft, there is a GM pilot bushing that has the correct inside dimension but it needs about .005 taken off the outside to make it fitright - easy enough to do with a drill and some emory cloth.

4.0L engines that I CAN'T use?

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