1995 mustang gt 5.0L gear oil, car is automatic, what gear oil weight and brand do I need ? can I use gasket on the diff cover or just black rtv ? thanks
75W90 is fine. Do not use any RTV, you don't need it. A gasket is the best way to make it seal. The RTV may seal at first, but eventually it will leak.
I had just RVT on my rear end and it sealed well. I just had it rebuilt at ford and I'm not sure if the tech used the gasket that came in the kit along w/ the RVT but I did have them put RVT back on it again. I also have an aftermarket girdle on the back, not sure how much of a difference that makes as far as using RVT VS using it on the stock cover.