1985 2.8L v6 XJ
CF Veteran
Joined: Aug 2008
Posts: 6,588
Likes: 495
From: Chico, CA
Year: 1986
Model: Cherokee
Engine: 4.3L with headers and full 3" exhaust system
To swap to a 4.0L you will need a donor vehicle. You will have to change just about everything including the transfer case. The best option is the Chevy 3.4L. That is pretty much a bolt in and can be gotten in various outputs depending on year. Speed parts are available also
CF Veteran
Joined: Jun 2016
Posts: 2,138
Likes: 278
From: Santa Clarita California
Year: 2001
Model: Cherokee (XJ)
Engine: 4.0L
Yes a 3.4L would be good but I think I was reading about some one putting in a supercharged 3800 V6 if you can put in that engine that would be a good 200 HP or more .
CF Veteran
Joined: Aug 2008
Posts: 6,588
Likes: 495
From: Chico, CA
Year: 1986
Model: Cherokee
Engine: 4.3L with headers and full 3" exhaust system
Since you brought it up, yes a good swap but the expense and difficulty is right there with an LS1, which has about the same horsepower and much more common
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