you'll run into needing to change to an open drive rear end, there's no simple bolt in replacement for the torque tube trans, might be as well to go with Patricks 3.38 rear gears
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics