Calgary Jeep Association

Author Topic: swapping a4.0l for a4.2l  (Read 419 times)

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Offline shaunm

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swapping a4.0l for a4.2l
« on: October 08, 2009, 11:00:09 PM »
I have a 1987 yj with a 4.2l and would like to install a 4.0l it is out of a1987 jeep cherokee? Any suggestions ? do I need a new computer the 4.0l was from an automatic , I would like to hook it up to my 5 speed.

Offline JENSSEN

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Re: swapping a4.0l for a4.2l
« Reply #1 on: October 09, 2009, 12:36:21 AM »
I have a 1987 yj with a 4.2l and would like to install a 4.0l it is out of a1987 jeep cherokee? Any suggestions ? do I need a new computer the 4.0l was from an automatic , I would like to hook it up to my 5 speed.

you need a ecm and harness out of a 5 spd XJ to make it work properly
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Offline cLAY

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Re: swapping a4.0l for a4.2l
« Reply #2 on: October 09, 2009, 10:23:05 AM »
You will also need to install an 4.0L flywheel to trigger the CPS. Your old 4.2L may or may not have the notches on it for the CPS. The 4.0L will bolt up to your 5spd but you'll need to see if your 5psd has the window cut into the bellhousing for the CPS.
Incompetence - When you earnestly believe you can compensate for a lack of skill by doubling your efforts, there's no end to what you can't do.
The only work I've done on a Rubi involved a chainsaw....

'93 ZJ, 5.2L, lifted/locked/36s..<gone>
'98 5.9e