Shaking when accelerating to sixty mph

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

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

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

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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Wednesday, September 12th, 2018 AT 4:35 AM

MAPARICIO