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2014 Gmc Sierra All Terrain transmission banging

Tattooo

By Tattooo
in Troubleshooting & Recalls

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Tattooo Senior Enthusiast

Tattooo

Posted
Posted

Does anyone else occasionally feel / hear a banging noise from the transmission when driving slow either accelerating or decelerating ? A friend has the same truck & has had the same experience

fondupot Senior Enthusiast

fondupot

Posted
Posted

If you are accelerating at low speed, and then let off the throttle, then get back on it hard, you will experience this "banging" you describe. This is drive line lash, and its normal. Its because you told the trans to do too many things in a short amount of time. speed up, no wait coast, no wait speed up again. It can only react so quickly.

 

If your truck is brand new, it is common because the transmission controller is still in its learning phase. after a couple hundred miles or so it will be smoother because it knows your driving habits.

Tattooo Senior Enthusiast

Tattooo

Posted
  • Author
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Makes sense & you described it perfect, better than I cpuld have...I have 2800 miles on it now so I hope it goes away

2strokesmoke Enthusiast

2strokesmoke

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This is caused by too much driveline lash/play. Better machining and closer tolerances, would eliminate this monster to an exceptable level.

Seems GM still slapping them together and not trying to improve this problem that has plagued them in the past

nikon2003 Enthusiast

nikon2003

Posted
Posted

I'm experiencing your issue, or similar... I have to drive slow threw my residential neighborhood in the morning 20-25mph and for some reason my truck hates that speed. Constant tranny shift clunks and switching of v4/v8 mode

 

Not to impressed...my 2011 was much smoother

Tattooo Senior Enthusiast

Tattooo

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  • Author
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Yeah 2strokesmoke .....same issue....that clunk drives me nuts esp on a $46 k truck

  • 2 weeks later...
Tattooo Senior Enthusiast

Tattooo

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It has subsided as I put more miles on the truck....may be learning my pattern ??

brandonbvr Enthusiast

brandonbvr

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I observed coming home from work this morning in cooler temps my truck rode like a cadillac at all speeds that were previously giving me shaking and vibrations (70-80mph). My tires are Michelins set to 32 psi cold (recommended on door tag). It was 60 degrees F this morning on my 30 mile all highway commute home. My trans temp was 170 degrees F. I also didn't experience any harsh downshifts or clunks on decel.

 

Something tells me that something in the driveline is out of spec or warps when it is hotter because when it is 80 degrees outside my truck doesn't ride this nice on the highway that's for sure.

 

Has anyone been able to notice these same results? Any ideas or input? My truck goes back to the dealer on Monday of next week.

  • 2 weeks later...
fondupot Senior Enthusiast

fondupot

Posted
Posted

I wonder if taking it out of over drive would help with this issue. Just a thought.

 

-David

 

 

...there is no overdrive....

bdbake01 Senior Enthusiast

bdbake01

Posted
Posted

 

 

...there is no overdrive....

 

Kinda yes, kinda no. Technically 5th and 6th are less than a 1:1 ratio, so we kinda have two OD's.

nikon2003 Enthusiast

nikon2003

Posted
Posted

Lately I've tried driving the truck in M5 when I'm under 60mph... Not sure on mpg downsides yet

 

But it keeps the truck out of V4 mode, and drives much nicer at lower speeds. Less clunking/bucking

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