1999 Jeep Grand Cherokee engine swap to 06 model HEMI - Jeep Cherokee Forum

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1999 Jeep Grand Cherokee engine swap to 06 model HEMI

Old 05-06-2017, 04:51 PM
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Default 1999 Jeep Grand Cherokee engine swap to 06 model HEMI

I have 2 jeeps....a 1999 with a blown 4.7 engine....my daughter just totalled a 2006 hemi grand cherokee....i want to put the 5.7 hemi in the 1999....what i am most concerned about is the wiring....can anyone tell me if i can use the wiring harness for the hemi and drop everything in the 1999 or do i need to buy a different harness? I would appreciate any help anyone can lend. My email is [email protected] thanks !!!
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Old 05-08-2017, 09:18 PM
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I will be a monster job youll have to make motor mounts and a lot of parts plus have to turn off the anti theft system on the jeep and engine.It would be a lot easier and cheaper to get another 4.7 and the wrecked one part it out and scrap the shell.
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Old 05-09-2017, 04:02 AM
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Yes, the HEMI is very complex with the MDS system that cuts out 4 cylinders electronically at low power settings. It would be a nightmare to integrate it with your WJ. It also uses electronic throttle control, or drive-by-wire as it's known. You COULD retro-fit it to the earlier specs, but you'd have to tear it apart and change an awful lot of parts.

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Old 05-09-2017, 08:27 AM
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maybe try and find another 06' with a blown engine or trans with a good body and swap into that.
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Old 05-09-2017, 08:27 AM
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Or sell the motor and as mentioned by a V8 designed for the 99.
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