Gear Lube For Sterling LS

[troutwest66]

I want to get the gear oil changed in the rearend before we go to Montana this coming Sunday and I was wondering what was recommended as far as a synthetic or blend that I can get locally or through NAPA since I can get a discount. Is Ford the only source for the friction modifier or are others available that work as well or better? I used Schaeffers syn-blend ATF in the ZF and transfer case. Do they have a gear lube that works well? What about Sta-Lube? Don't they make a synthetic as well? I plan on putting the same stuff in the front differential as well.

 

[kwazyca]

I just switched to Mobil 1 syn.

Read a bunch of good reviews for it. I got the friction modifier at NAPA but I do not remember the brand now.

Tom

 

[troutwest66]

So Mobil 1 makes a gear lube? What viscosity? 85-90? Good to hear NAPA carries a friction modifier. I'll be giving my NAPA guy a call in the morning!

 

[kwazyca]

My diff takes the 75-140 syn from the factory. I know they make a 85-90 because I almost accidentally bought one by mistake.

The limited slip additive was not a NAPA brand. I can't remember what brand it was. I already threw away the containers. Sorry. I just made sure it was compatible with Syn oil.

Tom

 

[The Warden]

I thought that most synthetic gear oils included a limited slip additive? Maybe I'm remembering it wrong, or maybe that's just the special stuff (Redline, Royal Purple, etc)...

 

[troutwest66]

I read Royal Purple does but I have no idea if that is standard in synthetics.

 

[pafixitman]

Gear oil

The Castrol I bought a couple weeks ago said it had it in there. Not that it matters since I'm not LS!

 

[JPR]

I thought that most synthetic gear oils included a limited slip additive? Maybe I'm remembering it wrong, or maybe that's just the special stuff (Redline, Royal Purple, etc)...

Same with Amsoil gear lube. Local drive train shop said to run it without the additive when I installed the front axle. It seems to work okay, however, I have a less than a thousand pavement miles on the LS plus a few "up to your knees in mud" miles.

 

[kwazyca]

Well....as usual. You guys taught me something. I did some research and found out I did not need to add the friction modifier to the synthetic oil.

I called around and no one thinks it will harm anything. Does anyone have a conflicting opinion?

Thanks,

Tom