I am switching from a T350 to a T400 in my 68. It looks like I need a bigger slip yoke for the front driveshaft. The existing drive yolk is too small. Also at the same time I switched my 8.2 rearend out for a 8.5 posi. So I think I need a new rear ujoint to accept the bigger rearend. Is this correct in my thinking or has anyone done this swap? I don't really want to buy a new driveshaft can I make the existing one work? Or should I be looking for a driveshaft from the boneyard that closer reseambles what I need. Any possible donor car suggestion? Thanks