I use straight 90 weight mineral based gear oil that I got from NAPA. The brand is Superior Gear Lube, but any brand will work. I would stick with what the shop manual designates.

Tim

"Pay attention to the details! It ALWAYS pays off."

1949 Chevrolet 3100 Series 1/2 ton Pickup
1964 Chevrolet C10 (Ol' Yella) (SOLD)
1958 Chevrolet Biscayne 2 door (SOLD)
1970 VW Beetle