I got the go ahead from the finance department (aka the wife) and will be swapping out the 350 in the K5 for a stroked 454. Part of it will be a tranny swap from 700r4 to a built TH400. The motor/trans are coming out of a drag car so the stall speed is pretty high on the converter (3500ish). From what I've read, finding the right stall speed is a bit of an art so I need some guidance. Here is what i think will be the pertinent information: Tire diameter is 37" final gear ratio of trans is 1:1 rear end ratio is open for suggestions, probably 4.56 or 4.88 HP at the crank 800+ Driving habit / use of truck: mud/sand, no crawling and of course hauling major a$$ off the line. dont care about interstate speeds. just want to play in the sand box and smoke some punks off the line. Links or any guidance is greatly appreciated. Haven't started turning the wrenches yet but want to plan everything out as best I can. Thanks guys!