2.5L 4cyl to a 4.2L AMC 6cyl - JeepForum.com
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Unread 09-06-2013, 10:59 PM   #1
Registered User
1995 YJ Wrangler 
Join Date: Sep 2013
Location: Grand Ledge, Michigan
Posts: 1
2.5L 4cyl to a 4.2L AMC 6cyl

Hi I am new to the jeep world. Just bought my first jeep and looking to build it up. It currently has the 2.5L and I have an opportunity to buy a 6cyl 4.2L AMC engine for $60. I was wondering if the conversion is worth the hassle. Thanks guys!

Vasicek is offline   Reply With Quote Quick reply to this message
Unread 09-06-2013, 11:50 PM   #2
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1989 YJ Wrangler 
Join Date: Nov 2010
Location: Sin City, Nevada
Posts: 2,881
It involves moving the motor mounts, you will need an AX-15 trans and the transfer case primary shaft will need to be changed.

The wire harness is different also. Is it carved or MPFI?? More issues to deal with.

It is a lot if work but folks do it all the time.

Fund the search box on the YJ page 1/3 way down header right side. There is a ton of threads out there.

Sent from underneath my Jeep
89YJ 2.5L TBI, AX-5, NP231 SYE, Ford 8.8, Yukon Grizzly, Tom Woods Shaft, 33" BFG T/As, 4" lift, Warn VR10000s.

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