What type of gear oil do I use in the rear axle?
I noticed that I've got a small leak developing from the diff cover on my 85's rear end. I know its probably the gasket. Should I use good old fashoned 80w-90 that I have in drums at work, or does this rear end need some sort of synthetic or additive? My 04' F150 needed some type of friction modifier and its just a standard axle, not a tracton lock. I believe since its a V6 I have the 7.5 axle. Any imput is appreciated!
2012 Mustang V6 Race Red