So... I've also given serious thought to an NV4500 (have one or two of those around) or a 4L80e (got a few of those too)
Pros of the 4L80e
fairly strong, should function well with stand alone computer, Auto trans is nice for a lot of what I plan do do with the Deuce..
Cons:
expense of stand alone computer setup, complicating something that was once simple (I don't like computers...) I would use the spare tranny I have stashed for one of my daily drivers...
Pros of an NV4500
I prefer a manual, cheap to setup, no trans cooler, simple...
Cons:
Clutch to wear out. Harder to rock the truck out of snow or mud when stuck. linkages and pedals to install/alter
I'm still pretty set on getting an overdrive trans (although I do have a good turbo 400 setting around) and at this point, given more research and thought... I'm leaning towards the NV4500 now...
All this is just ideas at this point... I'm still working on getting her fired up as is for now
I hope to get it in the shop and work on it a little this week, Will post pics (and video if I get life in her)