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Shaking when accelerating to sixty mph

Tiny
MAPARICIO
  • MEMBER
  • 2009 GMC ACADIA
  • 6 CYL
  • AUTOMATIC
  • 135,000 MILES
I recently purchased this vehicle. When increasing speed to or around sixty mph it seems to shake. I am wondering if it is the torque converter, needs balancing/alignment. Another mechanic mentioned it could be flat spots in the tires.
Wednesday, September 12th, 2018 AT 3:59 AM

7 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning.

Do you feel it in the steering wheel, through the whole truck or power-train?

The torque converter shutter is a common issue when the clutches slip in the converter. It usually does it under load when the torque converter is commanded to lock up.

Roy

https://www.2carpros.com/articles/automatic-transmission-problems

https://www.2carpros.com/articles/steering-wheel-shakes-when-accelerating-or-braking

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Wednesday, September 12th, 2018 AT 4:29 AM
Tiny
MAPARICIO
  • MEMBER
  • 4 POSTS
It does not really feel like it is the steering wheel. It is almost like something shaking the back end, but you can feel it throughout.
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Wednesday, September 12th, 2018 AT 4:31 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
It is hard to tell from here with the little information, but you can try this.

Go to a parts store and get an additive for torque converter shutter. Add it to the transmission fluid and drive it for about twenty miles and see if it helps. If it does, then the clutches are bad in the torque converter.

If it does not, then you need to have the drive train checked; such as the universal joints, motor mounts and tires.

Roy
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+1
Wednesday, September 12th, 2018 AT 4:35 AM
Tiny
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  • MEMBER
  • 4 POSTS
Thank you.
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Wednesday, September 12th, 2018 AT 4:36 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help. Keep us updated.

Roy
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Wednesday, September 12th, 2018 AT 4:37 AM
Tiny
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  • MEMBER
  • 4 POSTS
I took it to a mechanic. Turns out it is the rear wheel bearing.
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Wednesday, September 12th, 2018 AT 8:45 AM
Tiny
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  • MECHANIC
  • 52,797 POSTS
Okay, good find. A lot cheaper than a transmission.

Roy
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Wednesday, September 12th, 2018 AT 8:47 AM

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