Dave, I think the Boys truck is a 4" Superlift. Steering components are an adventure to be dealt with. May have to do a swap to crossover. The stock power assist stuff is NOT popular and his axle is a HD44 with big hubs. Probably the least common to boot.
Hi bignate, are you saying your boy has a truck with 4" super lift or?
Our truck here is the hd44 big hub axle as well. Open knuckle, disk brakes, big hub. It's non common, to say the least...