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I have a 91 1500 2 wheel drive short box that has a 4.3 that I am going to swap out for a LS1. I already have the motor and trans. and the harnes.I have read about every thread on the fourm but dont see much for older to newer swap.Can any body telling me what else I will need in parts and what I will have to do to wire it?Thanks
This is always a good place to start... http://www.ls1truck.com/forums/lsx-t...onversion.html
wiring, pink wires are switched 12v, red wires are 12v constant, black wire and black with white stripes are grounds. PCM will need to be reflashed with the VATS disabled. Blue wire from red 33 PCM connector is high and Green wire from blue 42 PCM are low fan controls. Re-read that post and follow the links and you'll find most of the answers.