Which 4.0's will bolt into my 1996 ZJ?

[FSJNate]

My 1996 ZJ with a 4.0 just let go with 290,600 original miles.  What Jeep years and out of which models can I look to for used motors?

[Rick_Bear]

If nobody chimes in.....

Call Zach (The Full Size Goo-Roo) at Z&M Jeeps...419-893-4533

[Joe Giglio]

Nate,
Check out the article from JP.

http://www.jpmagazine.com/techarticles/engine/154_0604_jeeps_kick_ass_engine_history_4_liter/index.html

Joe

[Scott Drawbaugh]

Hey Nate
Call Rodney @ 717-764-1501. He is located in Dover, PA....He is all about Jeeps and nothing else......He is very reputable....

[etaucher]

Not to steal your thread, but will the 4.0L V6 fit into my CJ7. Or is there to much cutting and welding needed?

[hillbilly]

the 4.0 is an i6 the 2.8 is a v6

[etaucher]

Yes I was corrected once before for calling the 4.0L a V6, my bad its the I6 :p

[hillbilly]

yeah it was just too easy. arent the 4.0s alot narrower than a normal cj motor?

[etaucher]

I thought I remember seeing some where on the internet, that someone did put a 4.0 into his CJ. But I can't remember.

[Rick_Bear]

Anything can be done...Modification being the correct language. With the correct motor mounts it can be mounted in a CJ

[FSJNate]

yeah it was just too easy. arent the 4.0s alot narrower than a normal cj motor?

The straight six found in the CJ's is a 258 ci (4.2L) [Late 70's and 80's CJ's, older one's could have 232 ci, buick 225 v6, or 4cyl].  The 4.0L (242 ci) is the same block with shorter stroke on the crank.  The hardest part of switching from a 258 to a 4.0L would be transfering the computer.