Cure for posi clunking

[PGBuick]

My fresh 65 posi was making nasty grinding/clunking noises on low speed turns after an extended highway drive.  I drained and refilled with two containers of GM posi lube plus Valvoline full synthetic gear lube.  Problem solved.  Just FYI in case anyone else has this problem.  I had originally filled with non-synthetic lube and one bottle of GM additive.

Pat

[Loren At 65GS]

Good point Pat, I too have had to use 2 doses of limited slip additive.

Loren