The Stovebolt Site Forums The Shop Area General Truck Talk 46 1/2 ton U-Joint questions..

My gearbox to the engine has 10 splines that fit into the intermediate torque shaft, from there to the differential are X universal joints connected by a short tube.
There are long shaft differentials that run from the diff to the gearbox, these have the bell housing at the forward end, can't comment on what way they fit together.