4.0L in place of 2.8L v6

XJ_ranger

NAXJA Member
NAXJA Member
Location
Port Orchard, WA
looking to buy an 86 comanche with a blown (shocking) 2.8L motor and swap in a 4.0L and ax-15 combo.
looks like some firewall masaging will be in order as well as some custom motor mount, mounts

of course the new engine will be complete with the newer cooling system, computer, complete wiring harness, and everything under the hood from the donor vehicle pretty much. Im looking to go with a 90-95 engine

i have heard that due to the complications - one person actualy swaped the entire front clip - body and all after deciding that would be easier...

anyone have an sucess with just swaping the motor in?

any pointers? im figuring out what the work load will be to get this comanche running again, and comparing that to the cost of a decently running comanche.

of course the work will all be done by me and my own busted knuckles...

the asking price of the comanche with the blown 2.8L, rebuilt ax-5, and otherwise complete is $750 -
im tinking that i can get it for $500, sell the ax-5 for $300 and be only $200 into it - then get a rear end wreck cherokee for like $500, sell both the axles and the t-case for the $500 and have a free engine...

anyway - am i dreaming too big? or should i just look for a running comanche with a 4.0L already in it?

thanks for any help
 
The 3.4 chevy V6 is supposed to be a bolt in if you are totally determined to buy this Jeep. If it were me, save a bit more, not to mention the head aches, and get a running truck with the 4.0. Just my .02
 
bubbajeeper said:
The 3.4 chevy V6 is supposed to be a bolt in if you are totally determined to buy this Jeep. If it were me, save a bit more, not to mention the head aches, and get a running truck with the 4.0. Just my .02
I've heard the firewall mods needs to put a 4.0 in a pre-87 just aren't worth it.
The 2.8, 3.1, and 3.4 GM V6's all use the same mounts, so any of them should drop right in. :lecture:

Oh yeah, I concur about waiting and getting a factory-4.0 truck instead. I think you'll be saving yourself from hours of headaches.
 
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