When I got the car last spring, about 200 miles ago diff was singing a bit. Was told by the ex owner that they had the pinion seal replaced time to look at things, 1st the vent wasn't working, and second the pinion was way I mean way to tight could not turn it by hand, so I loosened it needed the air wrench then tightened it up by hand with some preload, sang less but still time to fix. Parts on way from Summit doing wheel bearings as well. I'm guessing that the pinion nut was tightened with air wrench quite well the first time. Laurie
63 Pariesienne sport coupe (The Big GTO), black, maroon interior, 409 4 speed; former owner of a 59 El Camino, 63 Corvette SWC, 62 Chev Bel Air SC.
Mahone Bay, NS Still not old enough to need an automatic
Changing the bearings didn't work still sang! Kept me awake all summer. Changed the wheel bearings one leaked in 150 miles, was a Kumo bearing from Japan replaced it with bower bearing made in China worked not to bad. Move along to end of October got another pumkin from Pontiac previous owner got axles also they have real good bearings and price was right just take it out. Put it in and now things are quiet. had to replace the China bearing leaking this time got one on warranty.