Trans/Diff Fluid Change upgrade?
Race Director
Joined: Sep 2000
Posts: 11,143
Likes: 1,913
From: Missouri City, TX
Opinions will vary regarding the transmission but I am pretty certain from long experiences with C6 and C7 cars that the factory fill OEM fluid for the differential is DEXRON LS as the best. DEXRON LS was formulated and introduced as the factory fill in all corvette differentials starting with MY2009. It pretty much stopped the highly problematic low speed turning noise with the clutch plates grabbing with the old Mr Goodwrench fluids in the models prior to 2009. I have difficulty recalling anyone complaining on the Forum regarding their cars with the DEXRON LS installed either as factory fill or as a drain and refill maintenance fluid. I no longer have an A8 auto tranny and never did a fluid change on it while I owned it.
Tech Contributor
Joined: Oct 1999
Posts: 41,058
Likes: 9,820
From: Charlotte, NC (formerly Endicott, NY)
The GM-recommended fluid for the diff is P/N 88862624 and its available through Amazon.
I didn't get quite 3 quarts back in after I drained it. I also purchased this small quart bottle pump from Amazon, it made it a lot easier to get the fluid in the diff:
Sometimes the Amazon links in the forum will upset antivirus programs so if that happens to you copy the link and open a different browser window to use it.
Bill
I didn't get quite 3 quarts back in after I drained it. I also purchased this small quart bottle pump from Amazon, it made it a lot easier to get the fluid in the diff:
Sometimes the Amazon links in the forum will upset antivirus programs so if that happens to you copy the link and open a different browser window to use it.
Bill
Melting Slicks
Joined: Feb 2018
Posts: 2,184
Likes: 1,049
From: North Texas
If your changing the ATF fluid from the old version to the new fluid, Mobil 1 Blue Label, you will need 24 quarts to do a complete change.
There is a TSB on this subject and a lot of threads on this site too.
There is a TSB on this subject and a lot of threads on this site too.
Racer
Joined: Apr 2019
Posts: 263
Likes: 130
From: Effingham county GA
The Mobile 1 Synthetic LV ATF fluid is part number: 124715. This is the new blue label reformulated ATF fluid
For the differential gear oil, many forum member us Mobile 1 Synthetic Gear Oil 75W-90. It contains the limited slip friction modifier same as the ACDelco gear oil product.
For the differential gear oil, many forum member us Mobile 1 Synthetic Gear Oil 75W-90. It contains the limited slip friction modifier same as the ACDelco gear oil product.
Tech Contributor
Joined: Oct 1999
Posts: 41,058
Likes: 9,820
From: Charlotte, NC (formerly Endicott, NY)
The Mobile 1 Synthetic LV ATF fluid is part number: 124715. This is the new blue label reformulated ATF fluid
For the differential gear oil, many forum member us Mobile 1 Synthetic Gear Oil 75W-90. It contains the limited slip friction modifier same as the ACDelco gear oil product.
For the differential gear oil, many forum member us Mobile 1 Synthetic Gear Oil 75W-90. It contains the limited slip friction modifier same as the ACDelco gear oil product.
Bill
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