SAE 90
No you can not, It will burn the rear end up. You must use 80W90 gear oil only.
Can I use 80/90 luca gear oil
any 80/90 gear oil will do.
Hypoid Gear Oil 80/90
3.3 ounces of 80 weight or similar gear oil.
80w90 gear oil.
80 or 85W90 GEAR OIL.
75w9075w90
For a 1972 Chevy Nova rear end, the recommended gear oil is typically a 75W-90 or 80W-90 weight gear oil, which is suitable for most conventional rear differentials. If the rear end has a limited-slip differential, it's advisable to use a gear oil specifically formulated for limited-slip applications, often with additives to prevent chatter. Always check the owner's manual or service documentation for any specific requirements or recommendations.
80W-90 GEAR OIL
SAE 75W90 synthetic gear oil.
FOR THE REAR END, HYPOID GEARS ARE USED.