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Probably save a lot of trouble building up the 4L60E, and more fun to drive, too.
I'm working on it right now in my 4 door, swapping in an NV4500. Ive got most of the parts needed except for the clutch, master and slave cylinders and I still need to rebuild the manual t-case. Mounted my clutch pedal and cleaned up all my under dash wiring today
All the holes are premarked in the cab and it has the upper bracket for the clutch pedal, so the swap is pretty straightforward. There's a thread over on FSC by 88GMCtruck in the projects section it's a long read but there's tons of info in there if you take the time to read it. The gear ratios are almost identical to the 4L60E but with the benefit of having a 5.61 or 6.34 low gear and a pretty much bulletproof trans
Ther's already been a couple SUV's complete the swap as well as some trucks. A couple videos that they've posted up that serves as my motivation
http://www.youtube.com/watch?v=M6EGMocUm7Y
http://www.youtube.com/watch?v=lWzxNpDwIRA&feature=related
I had an accident in my pants just listen to this truck.
[yt]lWzxNpDwIRA&feature[/yt]
I think if I had time and money I would attempt this swap!!