I changed my diff fluid yesterday
Thread Starter
Le Mans Master
Joined: Oct 2012
Posts: 6,391
Likes: 1,453
From: South Dakota
I changed my diff fluid yesterday
I changed the diff fluid on my 2014 C7 Z51. I measured the drained fluid, and it was about 92 ounces, about 4oz less than 3 quarts. It didn't look as bad or smell as some photos I have seen. There was a little build up on the drain plug magnet, but not too bad. I filled with the same volume that I drained, and it was just starting to come out the fill hole. I used the 75W-90 Delco fluid that is recommended.
Accessing either the drain or fill holes was easy. It was a pretty easy job. Also, I used a narrow funnel placed beneath the drain plug and there were no messes.
Accessing either the drain or fill holes was easy. It was a pretty easy job. Also, I used a narrow funnel placed beneath the drain plug and there were no messes.
Thread Starter
Le Mans Master
Joined: Oct 2012
Posts: 6,391
Likes: 1,453
From: South Dakota
Burning Brakes
Joined: Jun 2013
Posts: 1,000
Likes: 282
From: Texas
I changed the diff fluid on my 2014 C7 Z51. I measured the drained fluid, and it was about 92 ounces, about 4oz less than 3 quarts. It didn't look as bad or smell as some photos I have seen. There was a little build up on the drain plug magnet, but not too bad. I filled with the same volume that I drained, and it was just starting to come out the fill hole. I used the 75W-90 Delco fluid that is recommended.
Accessing either the drain or fill holes was easy. It was a pretty easy job. Also, I used a narrow funnel placed beneath the drain plug and there were no messes.
Accessing either the drain or fill holes was easy. It was a pretty easy job. Also, I used a narrow funnel placed beneath the drain plug and there were no messes.
How did you get the new fluid up to the fill hole?
Last edited by agapsdiver; May 24, 2021 at 01:37 PM.
Thread Starter
Le Mans Master
Joined: Oct 2012
Posts: 6,391
Likes: 1,453
From: South Dakota
Melting Slicks
Joined: Mar 2013
Posts: 3,104
Likes: 626
From: Baton Rouge LA
I had to use a simple drill-attached pump on my GS. It's just too crowded up around the fill hole to allow a normal gravity-fed fill, or if there is a way I couldn't figure it out. As for pulling the plug, a universal joint attached to the ratchet is a must.
Drifting
Joined: Jun 2013
Posts: 1,428
Likes: 478
From: Maryland, USA
did u change it fully cold or after a drive and cool down? i was going to drive about 5 to 10 miles and let cool down about 40 mins or so, enough to get it lifted and things gathered up to get it rocking.
I plan to try to tackle an oil change, transmission, and rear end all at the same time but probably asking for problems trying to do so much.
I plan to try to tackle an oil change, transmission, and rear end all at the same time but probably asking for problems trying to do so much.
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Congrats on the preventative maintenance. Probably wouldn't hurt to do mine - thanks for the tips on the process.
Racer
Joined: Mar 2001
Posts: 326
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From: Newberg,Oregon,U.S.A.
I took my 17 GS in for tranny triple flush and asked to check the diff, they didn't tighten the fill plug!!! We went on a road trip and saw fluid leaking. Had a local tire shop tighten it for me.
