I'm considering the T5 conversion, but I have a Muncie M-22 I might drop instead. As for the 5 or 6 lug, well, I'd prefer the 6, but I'll make the switch to 5 if I have to. I'm not sure of rim size yet. Something in the 15" or 16" variety. Tire size is unknown as of yet. The truck will be a semi-daily driver with the occasional traffic light launch. I want a rear axle that I'll take whatever I decide to throw at it. Thanks for all your help.