I'm sure this was covered before but I'm having trouble finding a reference.

Looking for recommendations regarding gear oil for my '46 3600's trans and rear axle. The original spec is SAE 90 Hyphoid gear oil but I need to translate that to product that is available today. Assuming that some modern oils might be harmful to the yellow metals. Suggestions or pointers to additional resources are welcome.


1946 Chevy 3600 Pickup
1948 Chevy Sport Coupe Country Club
1963 Corvair Monza Spyder Convertible