2011 SS automatic - correct differential fluid?

[W.E.G.]

I want to drain and replace the differential fluid (gear oil... or whatever is popular to call it) in my 2011 SS.

The Helm manual Volume 1, section 1-43 says to use two fluids:

• 75W-90 Limited Slip GM part number 89021677
• Friction Modifier GM part number 1052358

These actual GM-labeled fluids appear to be scarce at most sources.

Unless there is some hard-core reason to use the GM fluids, I'd just as soon use substitute products that do the same thing.

Anyone care to comment on whether these products are suitable substitutes?:

• AC Delco part number 88900401 - 75W-90 Synthetic Axle Lubricant - https://www.amazon.com/Genuine-88900.../dp/B00BK7LXGM
• AC Delco part number 10-4003 - Limited Slip Axle Lubricant Additive - https://www.amazon.com/ACDelco-10-40.../dp/B000QGMXSU

[W.E.G.]

I guess I should have posted this in the "fluids and servicing" sub-forum.
http://www.camaro5.com/forums/forumdisplay.php?f=65

Still finding my way around this site.

[frankwjr]

just drain and put one of these in and call it a day bro...make life easy!
https://www.mobil.com/english-us/pas...-lube-ls-75w90

[W.E.G.]

May have answered my own question with some googling.

Looks like the AC Delco fluids I suggested for my 2011 are correct if the owners manual for the 2015 is on point.

[W.E.G.]

Originally Posted by frankwjr

just drain and put one of these in and call it a day bro...make life easy!
https://www.mobil.com/english-us/pas...-lube-ls-75w90

What about the friction additive?

[W.E.G.]

linking related thread from fluids forum

http://www.camaro5.com/forums/showth...light=89021677

[hammdo]

http://www.camaro5.com/forums/showpo...&postcount=344

This is what I used in mine

Now the updated number is:


https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Should work for the diff, limited slip additive already included..

-Don

[Ponchonutty]

Yeah I used Amsoil fluid and works like a charm. No modifier needed since it’s already in it

[Mr_Draco]

Holy crap the AC delco costs a lot.

Go down to Advance Auto or Auto Zone and get a bottle of Royal Purple 75w-90 and be done with it. It is made for limited slip diff's so you don't need the additive.

[Rock-It Man]

Diff fluid for 2010 Camaro V8:

75W-90 GM p/n 89021677
Friction Modifier GM p/n 1052358


Superseded by:

75W-90 GM p/n 88900401
Friction Modifier GM p/n 88900330


2017 Superseded by:

GM p/n88862624
No friction modifier required

Currently I am running #2 on the list with no problems.

[Bow Tie Affair]

Originally Posted by W.E.G.

I guess I should have posted this in the "fluids and servicing" sub-forum.
http://www.camaro5.com/forums/forumdisplay.php?f=65

Still finding my way around this site.

I have (2) freshly delivered GM# 88862624 for 43.00 shipped. Can send pictures and ship immediately!

[W.E.G.]

Originally Posted by Rock-It Man

Diff fluid for 2010 Camaro V8:

75W-90 GM p/n 89021677
Friction Modifier GM p/n 1052358


Superseded by:

75W-90 GM p/n 88900401
Friction Modifier GM p/n 88900330


2017 Superseded by:

GM p/n88862624
No friction modifier required

Currently I am running #2 on the list with no problems.

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Anybody care to comment on the supposed need to change axle seals when switching to 88862624?:

http://www.revbase.com/BBBMotor/TSb/...dPdf?id=180216
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[W.E.G.]

For better or worse, the differential fluid is now replaced.

On recommendation of my friend, and master mechanic, and shop owner, he installed:
Equa-Torque Differential Friction Modifier and 75W90 synthetic gear oil.
He was adamant that it would be foolish to change to the specialty fluids suggested in the service bulletin. Why replace perfectly good axle seals just for the sake of keeping up with GM's latest complaint-mitigation strategy?

Makes sense to me.

Indeed, I really couldn't care less if my hot rod makes a few funny noises when making slow turns in the driveway, so long as the funny sounds are not indicative of something being damaged unnecessarily.

The fluids were $80 and the labor was $55.
I did want to do it myself. But since I picked his brain about the subject at some considerable length, I felt it only appropriate to send the work to him.

Its been raining constantly since the swap was done. So, no significant road reports.
I did do a few slow figure-8's in a parking lot on the way home. A wee bit of groaning sound still there, but seemed less than before.

I will post back to this thread when I've had a chance to drive it more on dry roads.

[qcman]

Originally Posted by W.E.G.

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Anybody care to comment on the supposed need to change axle seals when switching to 88862624?:

http://www.revbase.com/BBBMotor/TSb/...dPdf?id=180216
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I had this done on my car.... So it has new seals and the newer fluid too. Basically the new fluid will eat the original seals. My car wasn't making noise initially. The dealer didn't put the FM in the first time when it was changed and she groaned and I complained.

So they found the TSB and it was covered by warranty so I have new seals now and the "newer' fluid. Its been fine since then.

Doing some Figure 8's after the change is a good idea to get the fluid out through the axles etc.

They were pretty embarrassed when I pointed out their error but all was fine in the end......