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Naw 5.7Did yours have 454 ?
I agree with that plan. Will the computer be compatible with big block?
I'd go ahead and get the harness from the donor truck, but it's not going to be a direct fit into yours. The squarebody and GMT400 harnesses aren't the same. However, with studying the wiring diagrams of both from the factory manuals (you'll find your truck's manual here in the forums, sticky post in this section - the squarebody can probably be found online, too) you should be able to piece them together as needed.
If you wanted to find a factory GMT400 harness that would fit your truck it would have to come from a 2500 or 3500 truck with 454/TH400 which would be 1988-1990. (or of course a 1990 454SS harness)
Richard
The one I'm getting is gonna come with harness computer and cruise control module I'll probably try to find one for the truck it will definitely be easier to swap out the whole thing especially with the engine outI'd go ahead and get the harness from the donor truck, but it's not going to be a direct fit into yours. The squarebody and GMT400 harnesses aren't the same. However, with studying the wiring diagrams of both from the factory manuals (you'll find your truck's manual here in the forums, sticky post in this section - the squarebody can probably be found online, too) you should be able to piece them together as needed.
If you wanted to find a factory GMT400 harness that would fit your truck it would have to come from a 2500 or 3500 truck with 454/TH400 which would be 1988-1990. (or of course a 1990 454SS harness)
Richard
It's for a 5.7 and in some spots rats have gotten to itWhat is wrong with the current harness in the truck?
It's for a 5.7 and in some spots rats have gotten to it correct the stock transmission is a th400 but it got stolen so I'm buying a th400 with 454 setup