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Vibration Issue is BACK and WORSE after being fixed

DENALIHD66

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DENALIHD66 Enthusiast

DENALIHD66

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Larger tires causing excessive exhaust regen?  Now I've heard it all.  I'm surprised they haven't blamed my window tint on anything related to the transmission yet.  Not sure why some dealers are such sticklers with it.  I understand to a degree... say if you had a supercharger installed and had it tuned, they would want you to remove those variables out if trying to troubleshoot a transmission problem.  But for simple bolt ons (ones that they offer from the factory for a HUGE $$$ markup), they should know it doesn't affect the performance nearly as much.  

  • 7 months later...
DENALIHD66 Enthusiast

DENALIHD66

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Haven't had the vibration issues, but I still have very hard shifting and laggy shifts between 1-2 and 2-3.  If I'm not punching the throttle, the transmission is downright unpleasant to drive, and I have to brace my body for when it shifts because of the jolt.  I have 2 years left on the powertrain warranty.  I am in between constantly going back to the dealer for troubleshooting to no avail, or just getting a custom tune done.  I would like to know though, if a tune will fix everything, or if it just fixes how it drives, and it will still leave me with the hard shifts that typically only happen on cold starts.  Once the truck is warmed up, its like the transmission "double clutches" and takes longer to shift between gears instead of just shifting.  

 

I want to love my truck.  I like most things about it.  Hearing that 6.2L scream with my Borla Atak is wonderful.  I get so many compliments on it.  Best sounding truck exhaust I've ever heard, and I'm not even being biased.  Some people say the Corsa's sound better, but the Corsa to me sounds more like a muscle car, whereas the Borla Atak sounds more like a truck exhaust.  I want to keep modding it, but not at the expense of all the other issues I've had with it, but most notably has been the transmission sloppy shifting and clunking.

Nasty Senior Enthusiast

Nasty

Posted
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26 minutes ago, DENALIHD66 said:

Haven't had the vibration issues, but I still have very hard shifting and laggy shifts between 1-2 and 2-3.  If I'm not punching the throttle, the transmission is downright unpleasant to drive, and I have to brace my body for when it shifts because of the jolt.  I have 2 years left on the powertrain warranty.  I am in between constantly going back to the dealer for troubleshooting to no avail, or just getting a custom tune done.  I would like to know though, if a tune will fix everything, or if it just fixes how it drives, and it will still leave me with the hard shifts that typically only happen on cold starts.  Once the truck is warmed up, its like the transmission "double clutches" and takes longer to shift between gears instead of just shifting.  

 

I want to love my truck.  I like most things about it.  Hearing that 6.2L scream with my Borla Atak is wonderful.  I get so many compliments on it.  Best sounding truck exhaust I've ever heard, and I'm not even being biased.  Some people say the Corsa's sound better, but the Corsa to me sounds more like a muscle car, whereas the Borla Atak sounds more like a truck exhaust.  I want to keep modding it, but not at the expense of all the other issues I've had with it, but most notably has been the transmission sloppy shifting and clunking.

8spd? Thats most likely why. i hate the 8spd. 

Black02Silverado Senior Enthusiast

Black02Silverado

Posted
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The Camaro guys are having the same issue with their 8sp transmission.  One would think GM would have this figured out by now since the 8sp is in another vehicle and not just in the trucks.

DENALIHD66 Enthusiast

DENALIHD66

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Yeah I specifically held off buying a 6 speed because they shifted like junk and were laggy.  The 8 speed shifts great when you are punching it.  But for daily driving its literally unbearable.  The new 10 speed better be good.  Being co-developed and already used in the Ford's I would assume GM would have the luck of the draw to get all the kinks worked out for launch.  I do like it has the ability to skip between gears, I feel like that would be more beneficial and reduce wear and tear.  But I guess time will tell. 

parthery Enthusiast

parthery

Posted
Posted

What are you running for tires?  I only ask because mine vibrated terribly, even after the transmission "triple flush".

 

I pulled the Bridgestones off and put on Michelin Defenders 2 weeks ago and there is a marked improvement.  Still have a little bit of vibration but nowhere near as bad as it's been.

DENALIHD66 Enthusiast

DENALIHD66

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Still got the stock Goodyear Eagle LS with 30k miles on them.  Pretty crappy tire overall but handles well on dry pavement.  Never really had an issue with them.  I only got them rotated once.  They are due to be replaced soon, hoping to get until winter with them.

  • 5 weeks later...
Gamsche Enthusiast

Gamsche

Posted
Posted

I'm worried I'm headed down this road too.  I drove several trucks on the highway at various dealerships, but the dealership I bought my truck at didn't have great access to a highway.  Annoyingly on day 2 of owning the truck I hit the highway and as soon as I crossed about 62mph the shudder started.  Granted it is slight, but noticeable.  I took it back with about 100 miles on it.  They looked at it and reproduced the issue but said GM won't let them touch tires until it gets to 500 miles.  So, once I get there I'm taking it back for tire balancing which doesn't sound like it ever helps.  Fun...

Donstar Senior Enthusiast

Donstar

Posted
Posted
19 hours ago, Gamsche said:

I'm worried I'm headed down this road too.  I drove several trucks on the highway at various dealerships, but the dealership I bought my truck at didn't have great access to a highway.  Annoyingly on day 2 of owning the truck I hit the highway and as soon as I crossed about 62mph the shudder started.  Granted it is slight, but noticeable.  I took it back with about 100 miles on it.  They looked at it and reproduced the issue but said GM won't let them touch tires until it gets to 500 miles.  So, once I get there I'm taking it back for tire balancing which doesn't sound like it ever helps.  Fun...

Interesting.  I remember reading a thread on vibrating trucks and later on felt some roughness at higher speeds.  I worried that the "chevy shake"  may have infected my truck.  The fact that I had found a small tire weight on my driveway gave me a glimmer of hope.  Sure enough, a balance is all I needed.  Don't let the horror stories on this forum make you think the worst.  Odds are strongly in your favor that your truck will soon cruise smoothly at highway speeds.

TXGREEK Senior Enthusiast

TXGREEK

Posted
Posted
Interesting.  I remember reading a thread on vibrating trucks and later on felt some roughness at higher speeds.  I worried that the "chevy shake"  may have infected my truck.  The fact that I had found a small tire weight on my driveway gave me a glimmer of hope.  Sure enough, a balance is all I needed.  Don't let the horror stories on this forum make you think the worst.  Odds are strongly in your favor that your truck will soon cruise smoothly at highway speeds.


You’re absolutely correct, I had a shake at highway speeds with my 14, turned out the shake disappeared once I switched out the tires.


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