Manual states "16 pt SAE 90 "multi purpose" gear lube.
Made sure it is for hypoid axle.
I run 85W-140 hypoid gear lube.


BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022