Rear diff low fluid
Melting Slicks
Joined: Sep 2005
Posts: 3,299
Likes: 1,488
From: RACE TRACK USA
Mine all failed with GM fluid and from heavy track use + excessive heat. Once I started using the Royal Purple the failures stopped. Still ran her hard on the track and never had another issue.
Le Mans Master
Joined: May 2000
Posts: 8,729
Likes: 1,508
From: Redmond WA
No sir. My first diff started whining after 3,000 miles on the GM fluid. They swapped it and the second one got about 10,000 before puking fluid out the breather valve, also with GM fluid. The third one whined from the moment I drove it out of the service area but I had given up by then. That's when I tried Amsoil with the GM additive and it chattered on turns. Drained and refilled with the GM juice and no more chatter but it still whined.
Racer
Joined: Dec 2012
Posts: 432
Likes: 171
From: DFW metroplex 2016 C7Z06 M7
Does anyone think there could be a problem if you over-fill it? I mentioned this “low diff fluid” topic to a service advisor at a texas-size chevy dealership. He said he had never heard of it, and, never seen any service bulletin, or similar advisory. I told him I might buy some fluid and pour it in the hole myself. He replied that over-filling it could cause an issue.
Race Director
Joined: Oct 2008
Posts: 16,671
Likes: 7,738
From: NJ
Does anyone think there could be a problem if you over-fill it? I mentioned this “low diff fluid” topic to a service advisor at a texas-size chevy dealership. He said he had never heard of it, and, never seen any service bulletin, or similar advisory. I told him I might buy some fluid and pour it in the hole myself. He replied that over-filling it could cause an issue.
do it on a lift.
Drifting
Joined: Feb 2014
Posts: 1,519
Likes: 145
From: Arizona
Instructor
Joined: Mar 2008
Posts: 123
Likes: 21
From: Warrenton VA
Just took my 17 in for its 500 mile 1st oil change. The diff was making some noise until warmed up. talked to the mechanic and he recommended a fluid drain and refill on the diff. No burnt smell or any metal in the fluid coming out but with the new fluid, the diff is quiet. btw, it was about 1/2 a quart low.
Burning Brakes
Joined: Mar 2015
Posts: 875
Likes: 311
From: Sundance WY
My 14 Stingray and my 16 ZO6 both needed to be topped off....I purchased both of them out of state and the local Corvette tech I use checked during the first oil change and did it no problem. Why the dealers that take delivery are not doing it is the real question. He told me the rears get delivered to the factory filled so they must have some reason not to top them off.
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Malinois Dad
Joined: Jan 2008
Posts: 2,570
Likes: 554
From: Kent WA
After reading this thread, I changed the oil in my rear diff - stuck my pointer finger in to the 2nd knuckle and could just barely touch fluid - so about 1/2 - 3/4 of a quart low. Car has 4,900 miles so I'm glad I changed it to the correct level.
I usually switch all my vehicles over to Amsoil and was surprised when the specs said to call Amsoil tech support for recommendations on the rear differential - when I called they said to use the GM recommended fluid.
I usually switch all my vehicles over to Amsoil and was surprised when the specs said to call Amsoil tech support for recommendations on the rear differential - when I called they said to use the GM recommended fluid.
