Diff oil
 

I was wondering I have 2 qts of this left over oil (unopened) I was going to use in my old car (traded in for my frs woohoo). Can i use this in my rear differential? its the 70W90 NS instead of the 70W90. We don't have clutch packs I don't believe in the rear, so didn't know if it was still ok to use. Thank you!

75W90 is the correct fluid for the Differential so it can be used, also the rear diff uses something like 1.3 quarts:

http://www.ft86club.com/forums/showthread.php?t=19218

Ya i didn't know since it had the NS behind it. Didn't know if they were that different vs the regular. I need to buy some tranny fluid too. This is GL5 so didn't think this would work in the tranny as its not GL5 its 3 or 4 from what i was seeing. Might do Motol 300, but i have never had issues with redline in any of the transmissions or race trannys before. Plus it always fixed any notchiness and made everything smoooth at any rpm or load. =D

I just put a mix of 70W90 and 70W90NS in my differential this evening....NS and/or non NS is fine with a Torsen differential, Torsen doesn't matter if you use additives or not, unlike clutch based unit.

For the transmission use Redline MT-85. I just put a mix of MT-85 and MTL in this evening... was working on shifter issue and had to pull the prop shaft...was time for fluid change in both the trasmission and rear differential anyways.

Transmission is 2.3 quarts, Differential is 1.2 quarts...

So I can use the left over NS (0.3 qrt) in the tranny then with MT-85 or MTL (2 qrts)?

I been really happy with motul

BUt yea 75w90 is the spec so if you got it use it

Should be fine if I remember correctly, only thing I remember that was important was that the tranny took GL3/4 but not GL5 and diff was the one that took GL5 or anything else.
That's what I remember but last time I changed it was a year ago.

75W90NS is GL-5 and GL-6; the manual calls out GL-3 for transmission and GL-5 for the differential - I would not use the Redline 75W90(NS) in the transmission.