Shaking when accelerating to sixty mph

2009 GMC ACADIA
135,000 MILES • 6 CYL • AUTOMATIC
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MAPARICIO
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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.
Sep 11, 2018 at 8:59 PM
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ASEMASTER6371
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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

Sep 11, 2018 at 9:29 PM
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MAPARICIO
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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.
Sep 11, 2018 at 9:31 PM
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ASEMASTER6371
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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
Sep 11, 2018 at 9:35 PM
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MAPARICIO
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Thank you.
Sep 11, 2018 at 9:36 PM
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ASEMASTER6371
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You are welcome.

Always glad to help. Keep us updated.

Roy
Sep 11, 2018 at 9:37 PM
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MAPARICIO
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I took it to a mechanic. Turns out it is the rear wheel bearing.
Sep 12, 2018 at 1:45 AM
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ASEMASTER6371
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Okay, good find. A lot cheaper than a transmission.

Roy
Sep 12, 2018 at 1:47 AM
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