I have a 1987 GMC V3500, his name is Private Pyle. Currently has a TBI 350, Turbo 400, NP205, 14 bolt rear, 60 front, H2 wheels with 315/70/17 Duratracs.
I'm not sure what gears it has in it, but they are very deep. I don't have a tach on it but it's wrapped out pretty good at 60-65 even with...