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Unread 07-08-2012, 02:18 PM   #1
jstick911
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Join Date: Sep 2011
Posts: 88
New motor for 2002 KJ

Have a bad 3.7 and know they have a history of going bad and was wondering if I can swap a 4.0?

I've looked here and some guys are going to the 04 3.7 and changing the PCM due to a reluctor difference but I really would rather put the old straight 6 in it because I think they have the same transmissions as the Cherokee.

Any help would be greatly appreciated!

Thanks
Jason

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Unread 07-08-2012, 03:45 PM   #2
tommudd
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2004 KJ Liberty 
 
Join Date: Aug 2008
Location: Central OH/ Moshi Tanzania, Ohio/Tanzania
Posts: 4,331
Way too much work to install an antiquated motor
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04 Liberty, Kilimanjaro Edition, Rock Lizard RockRails/Roof Rack/Front-Rear bumper,32 inch Goodyear Duratracs,Moabs,4.10s/ 4.25 inch JBA Coilover lift /other goodies
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Unread 07-08-2012, 04:39 PM   #3
streetglideok
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2005 KJ Liberty 
 
Join Date: Jul 2011
Location: Colorado Springs, Colorado
Posts: 2,415
Way too much work. Lot of guys dont even recommend going from the 2.5L gas four cylinder to the 4.0 in the wranglers even. The length of the engine alone would prevent it, or make it almost impossible. Might as well consider a v8 swap, if you want to go thru that much trouble.
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Unread 07-08-2012, 06:19 PM   #4
jstick911
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Join Date: Sep 2011
Posts: 88
Had no idea. Thanks for the input.

Guess my only option is to put the same 3.7 back in. I'm having a little trouble finding one, you guys got a tip somewhere to go to look to find one?
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Unread 07-08-2012, 06:59 PM   #5
streetglideok
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2005 KJ Liberty 
 
Join Date: Jul 2011
Location: Colorado Springs, Colorado
Posts: 2,415
You looking cheap and used, or good and reman? Mopar, and Jasper are two places I'd look, and at least one of them has one available.
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Unread 07-08-2012, 07:58 PM   #6
jstick911
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Join Date: Sep 2011
Posts: 88
I haven't checked mopar yet but I know Jasper is 3200 which is after the core change and for 200 more I can get one straight from the Chrysler dealership. Right now I think 2500 is a good price to pay for remanufactured or rebuilt motor after I put in the core charge
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