If you have a 96 model transmission, it's a 60e not a 700r4. They started the 60e transmission into truck in 93.

It's hard to compete with a ready-made 4 or 5 wire connection engine wiring harness vs trying to convert one yourself. I'd highly recommend one. NelsonPerformance can build you one up and all you do is hook into the existing wiring. Finding an LS1/LS6 factory harness gets harder all the time. A new one is crazy expensive.