Transmission Fluid

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Jun 13, 2025 | 11:13 AM

randy ransome

Thread Starter

Melting Slicks

Joined: Nov 2004

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From: Olive Branch Mississippi

Winner 2020 C4 of the Year - Unmodified

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Transmission Fluid

I have searched the forum and still can't figure out what to do. I have a 2021 corvette bought in January of 2021. It now has 11,350 miles and I haven't had the transmission serviced yet. Do I need to just change the fluid or fluid and transmission filter?
I know I was supposed to have had it serviced between 7,000-8,000 miles but I was past that milage when I discovered this.
Thanks

Jun 13, 2025 | 11:49 AM

moncal90

Burning Brakes

Joined: Apr 2002

Posts: 1,016

Likes: 364

From: Dardenne Prairie Missouri

Ummm, well you've missed 7000-8000 which is a filter change and you've blown by the 3 year service which is the fluid change. So I'd say at this point you need both services done.

Jun 13, 2025 | 12:02 PM

ZORANGE

Racer

Joined: Oct 2024

Posts: 471

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From: Old Dominion

This is a lesson to make sure you are aware of and follow the maintenance schedule posted in your owners manual.

Jun 14, 2025 | 08:59 AM

EvanD

CF Community Team

Joined: Nov 2005

Posts: 5,155

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From: Charlotte N.C.

Sounds like a life lesson to understand the maintenance requirements for things. Yes take it in ASAP or do it yourself and document it. Read your manual for other maintenance items too. If you have future DCT issues this could effect you ability to get warranty repair.

Jun 14, 2025 | 10:39 AM

Joe C5 C2

Pro

Joined: Aug 2004

Posts: 678

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From: Charlotte NC

The best approach would be to not do it yourself but have "Genuine GM Service" complete both procedures. Not a guarantee against a warranty denial but at least something to stand on.

Jun 14, 2025 | 10:41 AM

Daedalus51

Advanced

Joined: Apr 2024

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From: SoCal

Just as a data point, it would be great if you could retrieve the filter and cut it open to inspect what's trapped in it.

Jun 14, 2025 | 05:25 PM

Andybump

Race Director

Joined: Mar 2007

Posts: 11,261

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Quote:

Originally Posted by Daedalus51

Just as a data point, it would be great if you could retrieve the filter and cut it open to inspect what's trapped in it.

And share photos on the forum.

Jun 16, 2025 | 09:26 AM

Orion2011

Burning Brakes

Joined: Jun 2015

Posts: 1,186

Likes: 305

From: Shelbyville Kentucky

I plan to do the DCT filter yearly along with the yearly oil change. Once I'm in there is it isn't that much more work to go ahead and change the filter.