Are wiring harnesses interchangable? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-07-2006, 10:06 PM   #11
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also, according to the guys on clubgp the the 97 pcm wont work with a 98-99 harness because the pcm is wired differently. it could work but you would have to rewire the 97 pcm, which apparently isnt that difficult, just time consuming.

http://www.clubgp.com/newforum/tm.as...mode=1&smode=1
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Old 02-07-2006, 10:25 PM   #12
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I asked Rogue about the PCM, and it looks like I'll need to use one from a 99 GTP since that'* what the tranny I'm putting in came out of. I'll see if the wiring harness I got from a 97 Riviera will work, if it doesn't, I'll try something else. It is a learning experience after all. Thanks for the link.
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Old 02-08-2006, 09:36 AM   #13
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Aaron, do let us know how you do with this project. I, for one, am learning and can use all the info you can provide.

Thanks.
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Old 02-08-2006, 10:33 AM   #14
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I'm hoping to get this done in early March during spring break, so if any of you central Florida people feel like heading over to Melbourne for the weekend to help out...
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Old 02-08-2006, 11:51 AM   #15
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Well, I can't make any promises yet, but PM me once you know exactly what'* going down.
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Old 02-08-2006, 12:01 PM   #16
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See if this helps 96 Bonne different due to 4T60E tranny used. 97 different due to emissions and pin out at PCM very different. 98-2000 all have very similar wiring due to same emissions the odd pin is located differently at the PCM. 2001 up once again changes in emissions different charcoal cannister. Between Bonneville and GTP and others of the same years the wiring is similar but some changes in the PCM pin outs also differences in which pass key is used as well. My experience has been the 98/99 GTP PCM is the easiest to use when swapping into non Super Charged cars it uses the older passkey II and there are lots of reprogrammers out there who can do work on them. Another factor to remember when doing this swap is the axle shafts if the car does not originally have either the 4T60e or the 4T65e tranny axles have to be replaced the Bonneville and Park Ave I also believe the Olds LSS have larger diameter axles so the inner and outer shafts do noe intercnange with the ones off of GTP'* and Regals. When upgrading to a HD tranny the passenger'* inner shaft must be replaced with a HD one. I have wiring diagrams for many different 3800SC cars I can send some one if needed, I am on very slow dial up so it may be better to give me a mailing address and I will send them the old fashioned way. Dan
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Old 02-08-2006, 02:24 PM   #17
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Hmmm, so the 99 GTP PCM should work with some rewiring and possibly a little tweaking if it doesn't like my pass key. I always thought that the axles were the same for the 4T60-HD and 4T65-HDs. I'll measure them once the tranny arrives this week. Once I figure out exactly which harness and PCM I'm going with, I'll let you know which wiring diagrams I'll need. Thanks.
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Old 02-08-2006, 02:28 PM   #18
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Aaron..what are you planning here?
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Old 02-08-2006, 02:39 PM   #19
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The car is getting to the point where the stock transmission can't handle the power any more, so I need some sort of performance transmission. I found a 4T65 that was built by Intense for far cheaper than I could build up my 4T60, so I'm planning on swapping that in. While everything is out of the car, I'm going to put in the Stage 1X cam package from Intense as well. It'* a lot of work, but I think it will be worth it.
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Old 02-08-2006, 02:41 PM   #20
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Awesome...

Take your time and it will be easy. Consider getting an engine stand if you don't have one. It'* 1,000 times better than working on the ground.
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