Differential fluid
Thread Starter
Melting Slicks
Joined: Mar 2005
Posts: 2,104
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From: Boise Idaho
Differential fluid
As I acquired my Corvette with 32k miles, I want to make sure all applicable fluids are new. I did a search and didn't find much if any information on this. I also attempted to find the information in the user's manual, but either missed it or didn't find it. What interval should I change my differential fluid? What fluid/gear oil do you all use when you change yours? Any other tips or hints for the procedure?
Thanks!
Thanks!
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
there isn't an interval. GM felt that the rear diff fluid was lifetime.
The search function, however improved, seems to stop about April 30th, so that has now rendered itself useless again.
The rear uses a standard 75-90wt gear oil, synthetic or conventional, and 2 bottles (per gordon killebrew) of GM diff additive.
Add to the 2 bottles of additive, then the gear oil. There is a single plug on the right side of the differential (there is a tag on it). It requires a 17mm hex head socket and a small hand pump to remove and reinstall the fluids.
The search function, however improved, seems to stop about April 30th, so that has now rendered itself useless again.
The rear uses a standard 75-90wt gear oil, synthetic or conventional, and 2 bottles (per gordon killebrew) of GM diff additive.
Add to the 2 bottles of additive, then the gear oil. There is a single plug on the right side of the differential (there is a tag on it). It requires a 17mm hex head socket and a small hand pump to remove and reinstall the fluids.
Race Director
Joined: Dec 2002
Posts: 13,348
Likes: 233
From: SCMR Rat Pack'r Charter Member..Great Bend KS
Originally Posted by Deduncan
I did a search and didn't find much if any information on this.
You need to search on the Corvette Forum.....
...and/or buy a Helms manual. The manual isn't cheap, but it will pay for itself many times over.
Larry
code5coupe
Le Mans Master
Joined: Sep 2003
Posts: 5,874
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From: Littleton CO
Larry beat me to the punch. That other thread is the one I looked at while I did the job this weeked. There is no fluid change recommended in the manual, but it can't hurt anything to do it. After seeing my old fluid (very dark @ 51k miles), I now feel that it is necessary.
Le Mans Master
Joined: Sep 2003
Posts: 5,874
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From: Littleton CO
I'd be curious to have you check in with the hex size on your fill plug since mine appears to be an oddball. As you can see in the other thread, mine didn't take a 17mm but looks otherwise stock, with the tag & all.
Race Director
Joined: Jan 2002
Posts: 12,261
Likes: 85
From: O'Fallon Missouri
Originally Posted by jrp
I'd be curious to have you check in with the hex size on your fill plug since mine appears to be an oddball. As you can see in the other thread, mine didn't take a 17mm but looks otherwise stock, with the tag & all.
Le Mans Master
Joined: Oct 2004
Posts: 7,706
Likes: 485
From: Everett WA
C4 of Year Finalist (appearance mods) 2019
Originally Posted by bogus
there isn't an interval. GM felt that the rear diff fluid was lifetime..
