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Yes it will, I have placed in a 2001 4.0 into my 1988 Cherokee. My only difference was no place for the knock sensor "No big deal" and changing the temp sensor into a different water neck housing instead of the engine block. You will have no trouble switching the engine, just use all the outer parts from the 1988. Hope this helps. P.S. 4.0L I6 "Power Tech" - 177 hp @ 4750 rpm, 220 ft lb @ 4000 rpm - used 87-90 4.0L I6 MPI "Power Tech HO" (High Output) - 190 hp @ 4750 rpm, 220 ft lb @ 4,000 rpm - used in 91-95. So you will also be getting some better HP. :)

2007-01-06 15:46:41
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Q: Would a engine from a 1991 Jeep Cherokee 4.0 work in a 1988 Jeep Cherokee 4.0 or would you need more than just the engine to make it work?
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