Hope this doesn't open a can of worms, but looking for advise for gear oil for my "new" posi. Brand and viscosity please. Factory manual lists Buick P/N but no viscosity. Tom T? Thanks in advance.
Not that critical. This is what I use, http://www.walmart.com/ip/23325574?...39205352&wl4=&wl5=pla&wl6=78652275512&veh=sem That and a bottle of GM posi supplement, http://www.summitracing.com/parts/ado-10-4003?seid=srese1&gclid=CNLEw9XVwcQCFdcZgQodCYoAlg
Any 80W-90 non synthetic gear oil should work. I used generic stuff from my local Fleet Farm, along with a bottle of limited slip additive from the local parts store, when I installed in my posi rear.
