Just wondering what type of oil I should use in the tranny and rear axle of a 84 NA with a standard tranny. Im thinking 90weight gear oil. Is this right?

 

Red Line 75W90 is what I use in my 81+ LSD. Its synthetic and a bit pricey, and, no, you can't leave it in any longer than normal oil, but it quietened down my diff a bit and nothing is too good for my baby
Might be over kill if you don't have the LSD....?
Stu Aull
80GS
81+ LSD rear end
Alaska