Join Date: Aug 1998
Location: Waldorf Md. USA
I am going against the grain on this one. I am not sure why GM, and Ford have decided to start using the roller bearings, as they usually will not spend an extra penny if not needed, but.....I know there are ten bazillion bronze ones out there with no problems, and I know how many of the roller ones I have seen turned to red "dust" like bad u-joints. If you really thing about it, the ONLY time the bearing actually gets used is when you have the clutch pushed in. At all other times, the input shaft is turning the same speed as the crank, unless the clutch is slipping. Personally, I would rather have the entire surface of the bronze bushing to support the input shaft, instead of just the 12 little needle bearings. I have never seen a bronze pilot bushing fail unless there was some drastic misalignment present betweent eh engine and trans.
Maybe someone from Gm who knows the true reason for the roller bearing will chime in ??
Advanced Automotive Machine
1971 Chevelle "Heavy Chevy" original owner