Modified XJ Cherokee Tech XJ (84-01)
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2001 4.0l swapped into 99 4.0l xj

Old 04-07-2017, 03:49 PM
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Join Date: Apr 2017
Posts: 2
Model: Cherokee
Default 2001 4.0l swapped into 99 4.0l xj

I have an opportunity to buy a wrecked 2001 xj with a great engine and transmission. The engine has a new head and sounds awesome. I have a 1999 xj with 300k on it and rave to change the engine. Os this a straight forward swap I will simply swap engine and transmission from the 01 into my 99 along with the exhaust and write harness and pcm. I did the slip yoke eliminator on my np231 myself so I will just swap that onto the 01 transmission. Will the wire harness from the 2001 engine plug right into the body harness to run my gauges and other body systems?
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Old 04-08-2017, 10:20 AM
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Join Date: Dec 2012
Location: Midwest
Posts: 608
Year: 1998
Model: Cherokee
Engine: 4.0L

Does your xj have a distributor and wires or coil pack? i dont believe the XJs got the coil pack until 2000? if thats the case it may need the ECM and harness.
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Old 04-10-2017, 08:38 AM
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Join Date: Apr 2017
Posts: 2
Model: Cherokee

Yeah my jeep is a distributor engine but I do have the entire engine bay harness and computer so I thought swapping all of it would resolve any compatibility issues. I intend to swap out the trans and engine and complete engine bay harness from the 01 and reuse my transfer case since I already did the SYE.

Last edited by Randy Eckman; 04-10-2017 at 08:39 AM. Reason: Grammatical errors
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Old 04-11-2017, 07:49 AM
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Join Date: Aug 2011
Location: Prescott, Az
Posts: 37,874
Year: 1990
Model: Comanche
Engine: 4.0

The dizzy and coil packs can be kept on the vehicle getting the swap. That's easy.

2001 had different ports on the head and the heads are prone to cracking......
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