I am about to change my trans oil and rear diff. What kind of oil do you guys suggest and what grade of oil? I have a 2002 WRX 5 speed. Also i have a case of 75w90 redline, is this weight good for both trans and rear diff? Need help

I think your need 75w90 ns? I may be wrong... Try doing a search. the ns has something to do with syncros... Again Im not sure. I used royal purple for my diff but you could try some mobil 1 gear oil.

Thanks

happy to help