what diff and g/box oil is recommended ..

car used on street and track [small]


any help would be great its time to change out wanna keep it runnin well

 

75w90. Amsoil, Redline, Royal Purple, etc. You need almost 5 qts to do the diff and trans.

 

When I did mine, a gallon of NEO 75W90 did both. IIRC, the diff takes 1.4 qts., and the trans 2.6.

 

I think it's 1.6 and 2.6 Dave, but why quibble ?

 

I believe in using GL-4 synthetic in the trans and GL-5 diff oil in the differential. The lubricative requirements of the diff and tranny are actually quite different.

Considering that the correct lube can lower drivetrain losses (more power), it makes sense to me to buy optimal lubes for each one. FD owners are known to spend a lot more to get a lot less benefit.

My favorites include:
trans: Amsoil MTG 75w-90, Redline MT-90
diff: Redline Shockproof series

 

From the '93 FD service highlights manual (from the stickies):

Transmission, 2.6 qt.
Diff, 1.38 qt.

Dave

 

 

Dave