Rear Differential Lube

[Keyav8r]

I’m pulling the axles from the D35C rear end in my ‘91 Eliminator to replace a leaking driver’s side axle seal.  Will replace both seals and possibly the axle bearings depending on condition.

The manual calls out a SAE 75W-90 API-GL5 lubricant.  

Anyone using something different they would recommend.

This is a non-daily driver street truck, no off-reading.

[ComancheKid45]

Any 80w90 will be just fine, if you have Limited slip, be sure either the fluid includes friction modifier or you add it as well. 2qts of fluid will be enough.

[Keyav8r]

Thanks.  No LSD on the truck.  Got the diff open and axles out and everything looks good.

The shop that the PO used to service the truck put the diff cover back on with just RTV, no gasket.  Of course it leaked.  Going back on with a gasket and gasket sealer.

[HOrnbrod]

Last rear end oil I used was Red Line 58204 Full Synthetic 75W90 oil Fred. I was having some gear whine when making left turns, and the Red Line oil quieted it. Not cheap, but great for all differentials.

[Dzimm]

Agree with what's stated above. Anything 75w-90 works fine. Most come with the friction modifier already added anymore but for those guys with limited slips, it's important to check.

I've always used Valvoline full synthetic 75w-90. It's cheap and its always come out still clean when servicing.

Sent from my HTC U11 using Tapatalk

[Keyav8r]

Thanks, guys.  I picked up Valvoline 75W-90 dinosaur oil when Inwas at the Parts place getting seals, brake shoes, etc.  May take it back and get the synthetic version.  I didn’t see Redline on the shelf so will probably get the Valvoline synthetic.

 

[Crash]

Lube locker gasket FTW!