ok i know alot about chevys so here we go.....find the year out, short or long bed, body shape good or bad? check for rust in the rocker panels (trucks are bad about rustin those out), the granny gear tranny is good for mudding from what ive heard, ^ i wouldnt go with a TH400 (turbo 400) no overdrive either to my knowledge, a rockcrusher tranny maybe be a future upgrade but the granny gear will be fine unless you plan on doing some serious pulling or serious torque but you wont be making with a crate 350, any more questions just ask me