[MylilBowTie]

I seen plenty of th400 with bolt on yokes in 3/4 ton and 1 ton trucks. I've also seen them in vans. Both trucks and vans had two piece driveshafts. As for the "allison type" torque convertor. I believe it is a normal hd torque convertor with 6 mounting lugs vs the non hd 3 lugs. One thing that may be possible is that it could be a diesel convertor instead of a gas. But I would assume that would be a remote possibility.

Th475 parts can be put in th400 to make them th475. I used to know the specifics of what was different but cant think of all of them. I know the sprags are different, carrier, few other things. One of the part has to have another part so they will work together and doesn't work with the stock one.