I have no experience with this myself, but I can tell you what my manual says. It says if its noisy in high gear range it could have excessive clearence on the mainshaft. I just rebuilt mine and the clearance is supposed to be between .003-.012 between the gears.

Again, no personal experience! I hope that will help though... ohwell Jeff

My 1953 Chevrolet
1947.1 Gallery
1972 C-10 1/2 Ton & 1972 C-30 1 Ton