75w-90 or 80w-90 in Diff?

[Supra5MGTE]

I searched and didn't really find what I needed. I have a LSD 3.73 diff. I currently have the 85-140 thick stuff in there, but it didn't make the wine go away. so Theres no point having that thick crap in there eating power/milage if it's not helping any. Should I go with 75w-90 or 80w-90? Is there really a difference other than the 75 would be a touch better in colder weather? I'm going with basic dino lube. no high dollar stuff.

Do I need to add a LSD friction modifier additive for the LSD?


FYI: I just put MT-90 In the trans. got it in my 4runner and supra now.

[CJSREDPRA]

Since you are doing dino lube in the rear diff, you don't need any LSD friction modifier. Only needed if you are going synthetic.

[Greg G]

FWIW I used 90w and added the modifier.

Incidently when I went to my dealer to buy the additive, they told me it was out-of-stock. They then sent me to the local Ford dealer to buy theirs. They said its the same shit repackaged.

[Supra5MGTE]

I can't find straight 90W gear oil. Ok, no additive that's good. Now what about the 75 or 80?


Just drove it around town for some errands, with the MT-90 In the Trans. WOW:) Unbelievable! So nice. Feels like the 4runner's trans now. Now I truely believe in MT-90. Shifting is so much easier, especially downshifting.

[Dangerous Ken]

If you're staying with basic dino lube, then use Ford 75w90 diff oil.
'no high dollar stuff' - even Ford diff oil is expensive, about the same as Amsoil...

Ken

[Supra5MGTE]

I picked up 2 bottles of 75-90 Accel (Advance auto brand I assume) gear lube for $4.77/quart. Got it in. the 85-140 that was in there was very thick. i could tell by just shaking the 75-90 bottle next to the 85-140 bottle. So it's all done. 75w-90 in the rear end. NO additives. just dino lube. MT-90 Redline in the Trans. All set.