How soon did you replace the diff fluid?
Melting Slicks
Joined: Aug 2008
Posts: 3,023
Likes: 462
From: Toronto Ontario
I just did my axle fluid swap couple weeks ago around 1100 miles, the fluid came out dark and kinda yucky so glad that I changed it out.
I will run it another 2-3k then change it again and also change the trans fluid at that time.
Tony
I will run it another 2-3k then change it again and also change the trans fluid at that time.
Tony
Instructor
Joined: Sep 2018
Posts: 135
Likes: 134
From: Alabama
I did mine myself without any jacks or ramps and it was easy. I did use a swivel head ratchet. I had 1500 miles and had quite a build up of debris on plug. I was also almost a quart low. Put GM fluid back in. Good luck!!
Racer
Joined: Oct 2015
Posts: 395
Likes: 187
From: Clinton Twp MI
Purchased 2019 GS with A8 trans in November 2018.
My salesman recommended changing the rear diff at 1000 miles. Followed his advice. Fluid was silvery but not too bad. However, encountered under fill condition from the factory (frequent finding). Drained 74 oz and put in 85 oz. Easy job to do if you have access to the bottom of the car.
Also, had my A8 trans fluid triple flushed at 5000 miles when new fluid was released. Much smoother shifts.
My salesman recommended changing the rear diff at 1000 miles. Followed his advice. Fluid was silvery but not too bad. However, encountered under fill condition from the factory (frequent finding). Drained 74 oz and put in 85 oz. Easy job to do if you have access to the bottom of the car.
Also, had my A8 trans fluid triple flushed at 5000 miles when new fluid was released. Much smoother shifts.
Safety Car
Joined: Mar 2018
Posts: 4,754
Likes: 1,650
Purchased 2019 GS with A8 trans in November 2018.
My salesman recommended changing the rear diff at 1000 miles. Followed his advice. Fluid was silvery but not too bad. However, encountered under fill condition from the factory (frequent finding). Drained 74 oz and put in 85 oz. Easy job to do if you have access to the bottom of the car.
Also, had my A8 trans fluid triple flushed at 5000 miles when new fluid was released. Much smoother shifts.
My salesman recommended changing the rear diff at 1000 miles. Followed his advice. Fluid was silvery but not too bad. However, encountered under fill condition from the factory (frequent finding). Drained 74 oz and put in 85 oz. Easy job to do if you have access to the bottom of the car.
Also, had my A8 trans fluid triple flushed at 5000 miles when new fluid was released. Much smoother shifts.
Racer
Joined: Sep 2012
Posts: 310
Likes: 136
A friend of mine builds custom differentials for hardcore off-road vehicles. He recommends first change at 500 miles to remove all the metal shavings.
Amsoil recommends no earlier than 4,000 miles on differentials as a second view point.
Amsoil recommends no earlier than 4,000 miles on differentials as a second view point.
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Thread Starter
Le Mans Master
Joined: Oct 2012
Posts: 6,391
Likes: 1,453
From: South Dakota
I ordered GM OEM diff fluid today, and went out and bought a 3/8" swivel head ratchet. Diff fluid was $16 / quart. I ordered GM part # 88862624, which contains a friction modifier. I changed the diff fluid in my C6 several years ago and it was a very easy job.