Jeep TJ engine swap - Pirate4x4.Com : 4x4 and Off-Road Forum

dopey8358 · 10-07-2009, 09:55 AM

ok, so here is my situation:

A buddy blew a rod in his TJ, 99 4.0 auto, and we are gonna do a swap. We found a donor, 99 xj 4.0 auto, in a junk yard and the guy is willing to ship us what we need for $550.

I have yet to talk to the guy with the donor. my friend found the engine and wants me to figure out if it will work for him. What are some question i need to ask ti make sure that it will be compatible. i am still researching the issue but i would assume that we just need to make sure that the output spline count from the engine matches the blown one and things "should" fit, right?

any info on compatibility would be greatly appreciated!

airon197 · 10-07-2009, 10:02 AM

spline count only matters on the transmission or transfer case. Engine block won't matter, should swap over no problems.

dopey8358 · 10-07-2009, 10:09 AM

Awesome! thanks. the only reason i ask is that i know both jeeps have different transmission, the xj being the AW-4 and the TJ being the 32RH, well thats what Wiki had to tell me. will that cause any issues that i should know about or should everything just "line up" and bolt together as is?

10-07-2009, 09:55 AM	#1 (permalink)
dopey8358 Registered User Join Date: Feb 2007 Member # 86674 Posts: 3	Jeep TJ engine swap ok, so here is my situation: A buddy blew a rod in his TJ, 99 4.0 auto, and we are gonna do a swap. We found a donor, 99 xj 4.0 auto, in a junk yard and the guy is willing to ship us what we need for $550. I have yet to talk to the guy with the donor. my friend found the engine and wants me to figure out if it will work for him. What are some question i need to ask ti make sure that it will be compatible. i am still researching the issue but i would assume that we just need to make sure that the output spline count from the engine matches the blown one and things "should" fit, right? any info on compatibility would be greatly appreciated!

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10-07-2009, 10:02 AM	#2 (permalink)
airon197 Registered User Join Date: Sep 2006 Member # 79373 Posts: 62	spline count only matters on the transmission or transfer case. Engine block won't matter, should swap over no problems.

10-07-2009, 10:09 AM	#3 (permalink)
dopey8358 Registered User Join Date: Feb 2007 Member # 86674 Posts: 3	Awesome! thanks. the only reason i ask is that i know both jeeps have different transmission, the xj being the AW-4 and the TJ being the 32RH, well thats what Wiki had to tell me. will that cause any issues that i should know about or should everything just "line up" and bolt together as is?