Jump to content

21 GMC sierra AT4 6.2 shudder/vibration after trans flush

Recommended Posts

Recently took my AT4 in to service for the standard 45k service. At this time it’s recommended to do a flush, so we proceed to keep service Records up to date.

After about a week after the flush, I started to notice an increase in the shudder at 30-40 mph. It was alway noticeable coming to a stop prior the flush. Now it feels like a rumble in the steering wheel. A hesitant response feel, but once I step on the gas - I gain mph. 

I had my truck in for diagnostic around 28k to get my concerns recorded. For the most part I dealt with it and lived with the slight rumblings at stop. But after the flush, it seems worse. Am I going crazy, or is this a sign of something deeper to come?  I’m 10k from warranty going, so trying to get in front of it. 


Link to comment
Share on other sites

Take a look at this thread, 

Your issue sounds a lot like a valve body issue. Mine went out after transmission service. No indication of problems before the service. 


Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.