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Old 04-26-2005, 05:38 PM
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Wiring harness & computer swap?

I'm swapping an '87 305 TBI with a '96 350 TBI. Do I need to swap the harness as well or will the 350 computer and sensors hook up to the old 305 harness? I know its probably a duhhh question....but I just have to ask....(just in case someone else was wondering. Yeah, yeah thats the ticket...)

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Old 04-26-2005, 07:39 PM
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I haven't done this swap or anything, but it seems as if you would need to use the 350 comp and harness for the right air/fuel timing and other stuff. Theres a pretty good gap in time from 87 to 96 some parts probably have been updated i think it was 96 the engines changed. If it were me Id just swap it with the whole shabang comp and harness and have the ease of mind its meant to go together.
Good luck to ya.
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Old 04-26-2005, 11:51 PM
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[QUOTE=... Do I need to swap the harness as well or will the 350 computer and sensors hook up to the old 305 harness? [/QUOTE]

Don't even think about trying to use the old stuff. '96 (and up) is when a big change was made (Series I to Series II). The techology is worlds apart.
As an example, the VATS (Vehicle Anti Theft System) for your '96 will require you to (1) send the computer off to have the VATS bypassed directly or (2) wire in the BCM (Body Control Module) and fool it (something you can do yourself or (3) use the donor car ignition switch/key - BCM - PCM.
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Old 04-27-2005, 05:32 AM
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Wow....thanks. The build date was 12/95. Seeing as it was the last year for the old bodystyle, is it a '95 or '96? The '96 models were redesigned completely. If it is a '95, will it still have VATs and how do I know? (I have no key as the ignition switch works without it)

Thanks again..
Gear
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Old 04-27-2005, 10:53 AM
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Gear,
(I cobbled in a Series I '95 Pontiac 3800 into my project... all my practical experience is with Series I... all my Series II knowledge is simply stuff I picked up along the way).

Now you got me scratch'n my head... The only 'official' starting date I have ever seen for Series II technology is Jan '96. But there is an easy way to tell what you have. You are going to need the donor car shop manual (no matter what) so why not go ahead and pick one up. It will clear up a lot of these initial questions.

Re: VATS... You have a VATS system no matter what Series it is. If its Series I you can fool around in your shop for a few bucks and bypass it. I can tell you how if that turns out to be the case.

What was the donor car?
Using the donor car transmission?
Do you have the complete harness with all those little boxes that hook up to it?
Got Pics?

Another clue is the shape/number of pins on the DLC (Data Link Connector). (The DLC is what you would plug your scan tool into). Series I uses a 12 pin DLC and Series II uses a 16 pin. But even that is not definitive as some '96 G.M. products used the 16 pin DLC with Series I technology. To locate the DLC (I am assuming your harness is laying on the shop floor) look for the stuff that hooks up to/near the column as the DLC is usually located under the dash near there. Look
here...

Last edited by 36scsc; 04-27-2005 at 11:08 AM.
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Old 04-27-2005, 02:46 PM
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Thanks 36....the truck is an '87 1/2 ton chev and the engine & trans is from a '95/96? chev 2500 series van. I think the trans is a 4L60E (3 spd wi/OD). I have the entire truck, so I can get everything I need. I was going to save every box and gizmo attached to any wiring until figure out what everything is. Currently there has been nothing removed from the donor, as I thought I'd collect more info on what I should grab, before spending time on fruitless efforts.

Thanks, again

Gear.
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