Yes, That 90 SAE 90 weight gear lube is not easy to find. NAPA and TSC usually carry it in the back in 1 gallon or 5 gallon drums. You will need to ask a clerk or store manager, or someone who has grown up on a farm.

"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