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Re: wiring
Does your Tahoe have a 5.7 or a 5 liter gen 1 vortec ?
If so your current pump may handle stock ls motors
99 00 motors some have a different crank output length and iron heads
Look for 01 02 if you want to keep drivebywire
Most o3 up are drive by cable dont forget the peddle
Look up 96 98 truck swaps they will be very similar
Ltiswap has lots of good wiring info
Seen a few videos on YouTube where guys integrate the ls wiring and pcm into there 96 98 c1500
I would think 411 pcm upgrade would have helped switch wires around
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