5.2 Swap question - Is tranny a separate harness? - JeepForum.com

 
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post #1 of 5 Old 03-17-2015, 10:29 AM Thread Starter
bstrutton
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2001 TJ Wrangler 
 
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5.2 Swap question - Is tranny a separate harness?

I'm getting my parts together to do a 4.0 / 5.2 swap. My donor engine didn't come with a harness or ECM so I'm on the hunt. I haven't been able to determine definitively if there is a separate harness that goes to the transmission or if it's one big harness (engine & tranny). Can someone give me the skinny on this? Looked through most of the swap threads everywhere and some parts diagrams online but just can't find the answer.

While I'm asking, is there any difference in ECM from a 4x4 vs 4x2 donor (finding more/cheaper options if include 4x2..) ?

Just want to make sure I make as few trips to the wrecking yards as possible..

Thanks!

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post #2 of 5 Old 03-18-2015, 09:37 PM
skyj
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1990 YJ Wrangler 
 
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Location: Helena
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This thread will answer all that you desire.
http://www.jeepforum.com/forum/f12/5...e-yjs-1766593/

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YJ 5.2 magnum MPI, AX15, NP231 SYE, Dana 30 4.56 open/ 8.8 4.56 detriot locker. 1" shackles
2" BL, 4" stretch all on saggy waggy springs.
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post #3 of 5 Old 03-19-2015, 08:21 AM
skyj
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To answer just a few of your questions. Yes the engine transmission share the harness and they get their inputs from the ecm.
It shouldn't matter on the ecm whether it's a 4x4 or not i did the 5.2 swap and my ecm is from a 2 wheel drive auto truck and my harness is from a grand Cherokee.

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YJ 5.2 magnum MPI, AX15, NP231 SYE, Dana 30 4.56 open/ 8.8 4.56 detriot locker. 1" shackles
2" BL, 4" stretch all on saggy waggy springs.
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post #4 of 5 Old 03-19-2015, 06:04 PM Thread Starter
bstrutton
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Join Date: Nov 2005
Posts: 13
Thanks for the input it really helped. Managed to find a 2000 5.2 computer and harness today in great shape for two bills. Got my 2001 5.2 and tranny for 400. Gonna fire the 135k donor motor this weekend on the stand to verify.. Off and running!
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post #5 of 5 Old 03-11-2017, 11:49 AM
jamesdart
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Are you looking to run the dodge auto trans? Did you get the transfer case?
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