Good oil for differential?

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Richie

Richie

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Hi everybody.

I've been away for a bit. Same old thing saving cash for parts and working lol. I was wondering what oil is good for a differential. Royal Purple Max 75-90 for 8 3/4?
 
What do you have, for a diff setup? Royal Purple's sweet, seems overkill. I use ( and sell) standard 75-90 GL-4 ,add Sta Lube p.n. 411 ,for older limietd slip units. Just one opinion, others will follow...
 
I just dump in 90wt and forget about it.
 
Mobil 1 full syn with the limited slip fluid added.
 
Abodybomber said:
What do you have, for a diff setup? Royal Purple's sweet, seems overkill. I use ( and sell) standard 75-90 GL-4 ,add Sta Lube p.n. 411 ,for older limietd slip units. Just one opinion, others will follow...
Click to expand...

It's a 3.55 8 3/4 eaton truetrac
 
I use several different brands of 80W90, But always add friction modifier .
 
just use a decent name brand, not expensive and an additive. 80-90 Wt should be fine. RP seems overkill.
 
I believe Eaton recommends not using synthetic with a truetrac but they don't specify a weight. I'm going with what my gear manufacturer recommends in Dino oil.
 
I just got a trutrac and the previous owner stated that Eaton does not recommend synthetic and no friction modifiers.Plain gear oil.You may want to check their web site.
 
I have a eaton tru track in my 8 3/4 with 3.55s too!! I got it brand new, and it needs NON-synthetic oil... Just oil, no additives... They dont say anything about how thick.. I run valvoline 80w-90 with no problems
 
Well it looks like it's pretty much a no brainer... Just a good quality heavy oil. Thank you guys you're always helpful.
 
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