engine swapping

ksmithers88 said:

so my new xj has the baby 2.5L I4, and once i get a few paychecks built up, i'll be on the market for a crate engine. My question is this:

If i go with the jeep 4.0 (or 4.7 stroker) what will i need to purchase in addition to the actual engine to make sure all the pieces fit? I've seen sites advertising "rebuilt" and "replacement" 4.0's, but do i need to have had the I6 originally for these? I'm pretty much set on this engine, as they are bulletproof and run a damn long time.

Also, does the 2000 base model with the I4 have the np231 tc?
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I'll go off the guess that this is the 2000 since that's what you mention at the bottom of your paragraph. You will need the complete engine wiring harness and PCM from a 97+ XJ that had a 4.0L. You can use a rebuilt 4.0L just fine, I would request one from a 96-99 model year though if you're going that route, I think the vin is "S". You're correct in the fact that they're bulletproof and for that reason I would get one from a 97-99 XJ at a junkyard if you can find one. Often times there are still low mileage units out there. Your 2000 2.5L would probably have an NV-231 yes. Coincidentally, if you do this swap, could I buy your 4 cylinder engine wiring off of you if you do truly have a 97+ 2.5L?

PCM?

PCM - Powertrain Control Module - the engine computer basically....

JNickel101 said:

PCM - Powertrain Control Module - the engine computer basically....

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Not cheap unless you find a JY one. Several hunnerd clams, but can't do the swap w/o it.