C7 Transmission Triple Flush
Thread Starter
Cruising
Joined: Mar 2020
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C7 Transmission Triple Flush
I have a 2017 C7 Z06 with 7,500 miles. No problems. Going to have the triple flush done to get the garbage fluid out. Do I need to have the transmission Filter replaced also? I have be told no.
Last edited by Darcy Silva; Jun 21, 2025 at 12:28 PM. Reason: Forgot the word filter.
Team Owner
Joined: Jul 2004
Posts: 28,343
Likes: 3,252
From: Hartford WI
Team Owner
Joined: Jul 2004
Posts: 28,343
Likes: 3,252
From: Hartford WI
I thought it was because the A8 got the "hand me down" fluid from the A6 and the A8 was more sensitive to water in the fluid than the A6?
Melting Slicks
Joined: Feb 2018
Posts: 2,109
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From: North Texas
The TC was made smaller on the C7 than previous models due to the extra gear (8th). Everything got squished for it to fit. When the converter became smaller so did the clutches. The old style fluid just didn’t work thus the triple flush with the new Mobile 1 Blue Label became the fix.
Moisture in the old fluid made things worse and all this created the shudder problem.
GM changed out a lot of converters before they realized that moisture was the problem. Then the Blue Label came about for the fix.
Moisture in the old fluid made things worse and all this created the shudder problem.
GM changed out a lot of converters before they realized that moisture was the problem. Then the Blue Label came about for the fix.
Team Owner
Joined: Jul 2004
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From: Hartford WI
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Melting Slicks
Joined: Feb 2018
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From: North Texas
Yes, you should replace the 'Filter' but it's a maybe call with only 7500 miles on it.
Can't hurt and you already have the pan off.
When I changed my ATF I did not change the filter because I only had 1500 miles on it, and it was only 6 months old.
Can't hurt and you already have the pan off.
When I changed my ATF I did not change the filter because I only had 1500 miles on it, and it was only 6 months old.
Heel & Toe
Joined: Nov 2024
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Does the triple flush need to be done on a 2019 ZR1 that was assembled in late 2018? Only has 2k miles now and is not having any shuddering issues. Thinking of doing it to be proactive if its something that is recommended.
Team Owner
Joined: Jul 2004
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From: Hartford WI
Yes if it is done like the TSB says. No, if it is just a pan drop.
Burning Brakes
Joined: Jun 2002
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From: Vacaville Ca
the old fluid. My 19 ZR1 developed a 1-2 shift flair at 2K miles and said that my March build had the new fluid but they did a triple flush
anyway since it was under warranty and did not change the filter because of the low mileage.
That was in August 2019 and since then it's been rock solid .
Also you probly know the 19 ZR1 does not have AFM !
Team Owner
Joined: Jul 2004
Posts: 28,343
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From: Hartford WI
Did you get a quote with a DETAILED breakdown of what parts and how much labor or just a number tossed at you? You should be seeing $110 for the filter, $240 for the fluid and possibility $600 of labor including the misc fees.
Burning Brakes
Joined: Jul 2021
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From: Edgewater, FL
2024 C7 of the Year Finalist - Unmodified
Team Owner
Joined: Jul 2004
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From: Hartford WI
I'm not sure I see any real parameters. TSB seems to address what to do if you have a shudder and your car is older than Feb 2019. I believe it boils down to 2 choices if you are in that category. Either wait for it to absorb enough moisture to present a problem (not that it cannot do some harm before it actually makes you notice it) or dump the old fluid and spend $1000 before the old fluid has absorbed enough moisture to cause the shudder.
I Love My C7
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2024 C7 of the Year Finalist - Unmodified
2023 C7 of the Year Finalist - Unmodified
Hubs has worked on planes as his career and his stance is always change the filters and gaskets...