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2nd gear vibrations

darks1d3
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darks1d3 Enthusiast

darks1d3

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I have a bit of an odd issue with my 2019 8 speed transmission. Theres a slight vibration that can be felt and heard when going over 3K RPM in second gear. The dealership says it's "normal operation". Is it worth taking it to a different dealership or is it just something these transmissions do? I think it maybe happening in a higher gear as well over 3k RPM but I've only noticed it once when merging on to a highway. 

 

Jac365 Enthusiast

Jac365

Posted
Posted (edited)
5 hours ago, darks1d3 said:

I have a bit of an odd issue with my 2019 8 speed transmission. Theres a slight vibration that can be felt and heard when going over 3K RPM in second gear. The dealership says it's "normal operation". Is it worth taking it to a different dealership or is it just something these transmissions do? I think it maybe happening in a higher gear as well over 3k RPM but I've only noticed it once when merging on to a highway. 

 

I had something similar. Over 3k RPM in 2nd gear, almost a harmonic, sort of pulsing. Had it checked. Was told the area G.M. rep wanted to check it out personally as a diagnostic scan while in operation showed a shift/don't shift  situation.

 

  I was informed that the rep had them download some new program into the truck. I have put about 300 miles on it since. Much better than before, but I can still feel a slight vibration just a second prior to it shifting from second to third under high moderate to hard acceleration. Of course I am LOOKING for the issue now. Don't know if I would pick up on it normally. Normal puttering around it is absolutely fine.. My dealership has been excellent so far, they didn't pull the "thats normal" crud. Still debating if it should be looked into more or not. Got nothing to lose by going to a different dealer and it does document the complaint.

 

Edit to add: I put my truck into manual shift mode and went through the gears, starting at first and going through all eight gears. In my case the higher the RPM the worse the second gear vibration was, but ONLY after the 3k threshold. It was weird.

Edited by Jac365
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darks1d3 Enthusiast

darks1d3

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  • Author
Posted
15 hours ago, Jac365 said:

I had something similar. Over 3k RPM in 2nd gear, almost a harmonic, sort of pulsing. Had it checked. Was told the area G.M. rep wanted to check it out personally as a diagnostic scan while in operation showed a shift/don't shift  situation.

 

  I was informed that the rep had them download some new program into the truck. I have put about 300 miles on it since. Much better than before, but I can still feel a slight vibration just a second prior to it shifting from second to third under high moderate to hard acceleration. Of course I am LOOKING for the issue now. Don't know if I would pick up on it normally. Normal puttering around it is absolutely fine.. My dealership has been excellent so far, they didn't pull the "thats normal" crud. Still debating if it should be looked into more or not. Got nothing to lose by going to a different dealer and it does document the complaint.

 

Edit to add: I put my truck into manual shift mode and went through the gears, starting at first and going through all eight gears. In my case the higher the RPM the worse the second gear vibration was, but ONLY after the 3k threshold. It was weird.

Thank you so much! I thought I was the only one having this issue. It's been driving me crazy for the last year. 

 

My truck does the exact same thing in manual shift mode only after 3k. Does yours still do it in manual mode after the re-program?

Jac365 Enthusiast

Jac365

Posted
Posted

Tried it today. It does still do it, but not nearly like it was before. It is harder to pick up on even when holding second manually. Seems more noticeable when tranny is still cold versus normal operating temp. The slight vibration prior to the second to third shift is what made me take notice in first place and start trying to pin point what was happening. But even that vibration was so short and quick I thought I was imagining things

 

  It is still a little difficult to determine what is causing what as I have the Wrangler Duratracs on my truck and they are much harsher as far as  ride/noise compared to my previous trucks which had a more street friendly type of M & S tires. I am still debating bringing the truck back to the dealer to dig into it further. Operationally, it works well. No hard shifts, down shifts that I have read about.

 

 It's just that "feeling" that something just isn't quite right.  But I really love the truck and the loaner I got last time was a go kart with doors. (compact car). The service manager I dealt with told me to drive it for a few hundred miles and let the system do it's "re-learn". If I was not satisfied with the results to bring it back and they will do what they have to to get it right.

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  • 2 years later...
DHBWA Enthusiast

DHBWA

Posted
Posted

Bumping this.
My 8spd reacted positively to a 2x drain and refill except it has the same issue as the OP. With old fluid it shifted erratically and RPM would vacillate about 100rpm at 60mph.

 

Only issue with the truck now is the vibration above 3,000 RPM in second gear and only second. Love the truck but this is a little bothersome…

GMCustomerService Senior Enthusiast

GMCustomerService

Posted
Posted
On 12/21/2022 at 9:38 PM, DHBWA said:

Bumping this.
My 8spd reacted positively to a 2x drain and refill except it has the same issue as the OP. With old fluid it shifted erratically and RPM would vacillate about 100rpm at 60mph.

 

Only issue with the truck now is the vibration above 3,000 RPM in second gear and only second. Love the truck but this is a little bothersome…

This is certainly not what we like to hear, DHBWA.  Please know, customer satisfaction is extremely important to us. Our team would be more than happy to take a closer look into the concerns with your truck. To do so, please send an email to [email protected] with ATTN: DHBWA/GM Trucks in the subject line.

Please include your contact information, VIN, a brief description of your concern, and the name of your preferred dealership. We look forward to hearing from you. To learn more about GM’s Privacy Policy, please visit https://www.gm.com/privacy-statement.html. The information you provide may be monitored and recorded and is subject to the GM Privacy Statement.
 
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