engine swap
- Thread starter jakbob
- Start date
jaymz77
New member
I am finishing up a swap with a GM 4.3L V6 into my 2.5L YJ. Replacing the engine, transmission, transfercase, fuel delivery, driveshafts, radiator, ECU, and other random parts has cost me about $1700 and I still don't have all the parts I need to finish. That price is total cost of parts without having sold my old engine and t-case. Swapping a Jeep 4.0L should not cost this much since you should be able to reuse a lot of original parts. I do know that you have to move engine mounts forward to fit the 4.0 in place of a 2.5L. Have you considered using a V6? It is a lot more light weight than in I6 and the GM V6 is supposed to produce around 200 HP and 274 ft. lbs.
jakbob
New member
ok so i plan to get an i6 and an ax15 but will the chrysler 8.25 i got do the job? or will i need to get a dana 44? also... i know that the engine mounts would have to be moved, could i use the ones from the 4banger? and i heard somewhere that i would have to cut into the firewall...is that true? im trying to figure out how much trouble it is gonna be....
Bounty__Hunter
Super Moderator
The 8.25 is fine, came stock behind the 4.0L with the tow package.
You'll need to massage the firewall with a BFH to get the 4.0L to clear, as well as modify the front clip forward of the engine. You'll need the 4.0L motor mount perches but they bolt right in.
It's generally more of a headache and $$ to make a 4.0L work, and easier to go custom like the 4.3L Vortec. The 4.3L will fit better.
You'll need to massage the firewall with a BFH to get the 4.0L to clear, as well as modify the front clip forward of the engine. You'll need the 4.0L motor mount perches but they bolt right in.
It's generally more of a headache and $$ to make a 4.0L work, and easier to go custom like the 4.3L Vortec. The 4.3L will fit better.
dingus
Active member
that 4.3 vortec is common in later model blazers n jimmy's... i know the '97 models came with it at least so i'd imagine anything with that body style would be fine. should be cake to find one. if you call up a parts yard the "4.3 vortec motor" is such a commonly known motor that you wouldn't have to tell them what it comes in, just say you're puttin it in ur jeep.
BFH = big F'in hammer. Swing away.
Front clip is the front end of the car (generally what you replace when you rear-end someone... front bumper, fenders, grille, front cross member, radiator supports, hood, that kinda thing.)
BFH = big F'in hammer. Swing away.
Front clip is the front end of the car (generally what you replace when you rear-end someone... front bumper, fenders, grille, front cross member, radiator supports, hood, that kinda thing.)
Last edited:
jakbob
New member
well the way i see it...one way involves another 2.5...but the ones i can find are like remanufactured at like 1600 dollars...the other way i can do a crap load of work and get a 4.0, ax15 and maybe another 231 for the same price....but the regearing sounds like a good idea...i dunno...im still trying to figure out what to do...how would i go about regearing?
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