Ring and Pinion Gear

[thomasso]

You are correct .012 max.

[CobraJoe]

I'm old, always been 90w

[hiball3985]

I took my third member to a rear end shop for new gears, bearings etc. When I asked about synthetic lube he said it is fine and the only concern would be having old axle seals. This is the first time I've used synthetic and 8,000 miles so far with no issues.. All my other cars I use 80-90 GL4.