Rear Diff Fluid
Burning Brakes
Joined: Apr 2015
Posts: 926
Likes: 211
From: Sammamish Washington
I don't recall the correct gear oil, but do recall seeing it in the manual. Look it up and make sure that whatever you do use meets that spec Keep the receipt and you shouldn't have any reason to be concerned.
Le Mans Master
Joined: Sep 2003
Posts: 8,847
Likes: 795
From: Longview Texas
Really no good reason to use anything but GM fluid on street car. Some of the full synthetics have caused problems in earlier model Corvettes, especially in the transmissions.
The GM diff fluid also already has the special additives in it. Don't think GM ever actually says they approve other brands. It I up to the other manufacturers to prove they meet the GM spec.
The GM diff fluid also already has the special additives in it. Don't think GM ever actually says they approve other brands. It I up to the other manufacturers to prove they meet the GM spec.
Last edited by TEXHAWK0; Apr 29, 2018 at 09:52 AM.
Premium Supporting Vendor
Joined: Oct 2016
Posts: 3,851
Likes: 470
From: Manassas VA
Regards
Chip
Thread Starter
Le Mans Master
Joined: Sep 2012
Posts: 7,146
Likes: 1,940
From: Hagerstown MD
St. Jude Donor '15-'16,'18
What are the "specs". I know the correct weight is 75W90 but the ACDelco has "friction modifiers". Not sure if the aftermarket brands would have them. I just plan to top off with the OEM fluid if my rear diff level is low.
Team Owner
Joined: Jan 2007
Posts: 29,065
Likes: 1,839
From: cookeville tennessee
ttt
GM stuff don't last very long at all it breaks down really fast.
I have put AMSOIL SYN in all of my holes to put oil into. I shot my warr a long time ago.
A number of guys in here has be having problems with the oil in the stick car in less than 10,k miles not shifting good & all. Plus have said when they drained it out was really dirt looking. Yes a few chged it out with the GM stuff again & said it fixed the shift & was much better.
I just like the AMSOIL stuff it will last much longer without give any sing of what the GM does plus after chging the AMSOIL back out at 25,k it looks almost as good as the new stuff that I put back into the car. Robert
I have put AMSOIL SYN in all of my holes to put oil into. I shot my warr a long time ago. A number of guys in here has be having problems with the oil in the stick car in less than 10,k miles not shifting good & all. Plus have said when they drained it out was really dirt looking. Yes a few chged it out with the GM stuff again & said it fixed the shift & was much better.
I just like the AMSOIL stuff it will last much longer without give any sing of what the GM does plus after chging the AMSOIL back out at 25,k it looks almost as good as the new stuff that I put back into the car. Robert
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