[Karl Wescott]

I think something missing in this discussion is the weight on the axle. Engine torque and thrust are not the only considerations, the load carrying ability of the rear end structure and bearings should be considered as well as the braking torque on the axle housing (related to total weight of the vehicle). If Gary is not going to carry more weight than the 1/2 ton pickup at full capacity he should be just fine. If the rear end will be overloaded then think bigger. The 8" is a great little rear end (emphasis on LITTLE) and should be reserved (and preferred) for roadsters, coupes, and pre 1935 sedans.