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View Full Version : Help with YJ engine swap


Lacsar3
01-30-2008, 04:55 PM
I am planning on putting a 92 4.0 in my 90 yj that had a 2.5. As soon as it warms up here (-40)

Wondering if someone has done the same swap?
Also wondering if since they only came with 4.2's that would be a problem?
I am somewhat mechanically inclined, but thought someone might help me out with things that i might run into.
I have the engine, tranny, t-case all the wiring with computer, rad, exhaust, motor mounts. a few things i've seen so far are the computer in my 90 is under the dash and the doner fits on firewall in the engine compartment, can i just leave the old one in? i'm sure i will have alot more questions when i actually start, but thought i might get some headsup info before.
Thanks for now.:)

Joe Dillard
01-30-2008, 10:24 PM
Do some yahoo & google searches using phrases like; "2.5L to 4.0L swap" etc.

Tons of info out there.

Also, you are going to have tranny & tcase items you'll want to address at the same time (or at least I would).