You need to replace the 2.9 engine harness with the 4.0 harness and computer. Then splice it in with the body harness for the proper power and such. I did the swap using a haynes and chiltons manual for the wiring diagrams. Your driveshaft length is fine but the tranny will not live behind a 4.0, you're lucky since you have an automatic that both the 4.0 5 speed and auto are the same length as ...
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Started 1 month, 4 weeks ago by sleddog0303
I would like to take the 4.0 out of my '92 and install it in my '87 that has a 2.9 in it. Do the wiring harnesses transfer over without too much splicing. And are the motor mounts the same. Also will i have to do anything to the driveshaft. Thanx for your help. steve
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sleddog0303 replied 1 month, 4 weeks ago
Thanx man . i really appreciate the reply.
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Adam Baker replied 1 month, 4 weeks ago
There is no real splicing, per se. The 4.0 engine harnesses wil plug into your dash harness.
When I did my 4.0 swap, the only issue I had was the connection leading to the fuel pump and the rear end. I had to repin the harnesses to get hte proper connection. However, its possible that in a 92, the pinning will be correct and you wont have to worry about that.
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HahnsB2 replied 1 month, 3 weeks ago
Quote:
Posted by Adam Baker
There is no real splicing, per se. The 4.0 engine harnesses wil plug into your dash harness.
No it won't, 1st gen wiring harnesses are quite different than 2nd gens...
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drppdyllwrngr replied 1 month, 3 weeks ago
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Posted by HahnsB2
you're lucky since you have an automatic that both the 4.0 5 speed and auto are the same length as your current tranny.
the front yokes are different though. i ran into the issue when workin on my 93. the junkyard kept giving me 5 speed manual shafts when i needed an auto shaft. length ...
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Adam Baker replied 1 month, 3 weeks ago
Oops, I didnt pay attention to what year it was. For some reason I thought he had a G2.
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Posted by HahnsB2
No it won't, 1st gen wiring harnesses are quite different than 2nd gens...
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HahnsB2 replied 1 month, 3 weeks ago
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Posted by drppdyllwrngr
the front yokes are different though. i ran into the issue when workin on my 93. the junkyard kept giving me 5 speed manual shafts when i needed an auto shaft. length and yoke were different.
so with that said, if you have auto and are putting in an auto, shaft won't be an issue. if you go from 5...
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drppdyllwrngr replied 1 month, 3 weeks ago
didn't think of that. 2wd shaft matters
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