Shake/Vibration from 65 mph and higher - GMC Acadia Forum: AcadiaForum.net
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post #1 of 24 (permalink) Old 08-28-2012, 08:36 AM Thread Starter
tk
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Shake/Vibration from 65 mph and higher

Hello ALL - I have a 2007 GMC Acadia (SLE AWD) - New struts 1 year ago. New tires (balanced) and aligned 1 week ago. I am still getting a vibration (side to side) staring around 65 mph in my center console and floor board. Slightly in the steering wheel but I think that is just from the vehicle shaking. Any thoughts on what this could be?
I know search the forum. I did. Just looking for a solution.

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post #2 of 24 (permalink) Old 08-28-2012, 09:00 AM
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Re: Shake/Vibration from 65 mph and higher

Did you have this vibration prior to the new tires? If so, it could be anything from a funky rotor to a motor mount.
You didn't mention a fresh 4 wheel alignment with the new sneakers, was that done? Not trying to insult you but,
are you sure the tires are the correct size?
Tire balancing is an art, Sears, NTW, Joe's Tire Barn, etc, these guys do lousy jobs. Have a good friend recently
b!tch about vibration after new tires installed/4 wheel alignment in a '10 Slade. He drives the car likes its stolen,
just like me. Recommended he take the slade to a performance shop for balancing, worked like a charm. YMMV.

An 07 is 6 years old now. If the tires are quality, properly balanced, 4 wheel alignment has been done... you're
looking at a funky rotor, motor mount(s), a bad pulley, who knows. I'd start with 4 wheel alignment (yes/no) and
balancing at a good shop, go from there.

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post #3 of 24 (permalink) Old 08-28-2012, 09:16 AM
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Re: Shake/Vibration from 65 mph and higher

@tk, another thing you could try is to contact the place that did the balancing a week ago. I can only speak from personal experience, but when I have this type of thing happen with a vehicle I use to own, the company was glad to check this out free of charge since it was within 30 days of having the new tires and balance performed.

Please, let us know how things are going with this. Vibrations can be such an annoying concern to figure out with all the small parts that are in the vehicles these days.

Michelle, GMC Customer Service

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post #4 of 24 (permalink) Old 08-28-2012, 09:26 AM Thread Starter
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Re: Shake/Vibration from 65 mph and higher

I did have the vibration with the old tires. Had them rebalanced at the dealer. Helped a little but was still there. And I do have the correct size tires (Continental), and don't worry - I'm not offended. I will start AGAIN with a better balance hoping that is the problem. It's just odd that it does not start vibrating until 65mph. Smooth as butter below those speeds.

Suspension is all tight - just had it looked at. I can have them check the motor mounts. There is a TSB 07147 for the prop bolts, could even be that.

Thanks for your input capecodacadia, appreciate it.

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post #5 of 24 (permalink) Old 08-28-2012, 11:19 AM Thread Starter
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Re: Shake/Vibration from 65 mph and higher

Thanks Michelle - I'm having them check the balance again on Thursday along with the motor mounts - wheel bearings - brakes. Then the drive shaft is coming out so the balance can be checked along with the U-joints and bolts. This is driving me NUTS.

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post #6 of 24 (permalink) Old 08-28-2012, 11:32 AM
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Re: Shake/Vibration from 65 mph and higher

Quote:
Originally Posted by tk
Thanks Michelle - I'm having them check the balance again on Thursday along with the motor mounts - wheel bearings - brakes. Then the drive shaft is coming out so the balance can be checked along with the U-joints and bolts. This is driving me NUTS.
When you feel the vibration in the console, and not so much in the steering, it indicates some issue with the rear wheels vs. the front. You may have a bad wheel bearing in one of the rear wheel positions, especially since the vibration doesn't start until 65 mph.

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post #7 of 24 (permalink) Old 08-28-2012, 02:26 PM
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Re: Shake/Vibration from 65 mph and higher

Quote:
Originally Posted by tk
Thanks Michelle - I'm having them check the balance again on Thursday along with the motor mounts - wheel bearings - brakes. Then the drive shaft is coming out so the balance can be checked along with the U-joints and bolts. This is driving me NUTS.
No problem! Please, let me know how things are going with this.

I hope you are able to enjoy your holiday weekend.

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post #8 of 24 (permalink) Old 08-28-2012, 07:50 PM
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Re: Shake/Vibration from 65 mph and higher

Quote:
Originally Posted by XRDreamliner
When you feel the vibration in the console, and not so much in the steering, it indicates some issue with the rear wheels vs. the front. You may have a bad wheel bearing in one of the rear wheel positions, especially since the vibration doesn't start until 65 mph.
I agree with XRDreamliner, having worked for a GM-H dealer in Australia this is an easy diagnosis method we used to localise where the vibration is being generated. The combination of floor pan vibration and speed of vehicle when it occurs would indicate rear driveline or tire balance issue.

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post #9 of 24 (permalink) Old 08-28-2012, 09:04 PM
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Re: Shake/Vibration from 65 mph and higher

TK, *HAVE* you done a 4 wheel alignment with the new tires?

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post #10 of 24 (permalink) Old 08-29-2012, 10:23 AM Thread Starter
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Re: Shake/Vibration from 65 mph and higher

capecodacaia - Yes, I did a 4 wheel alignment after the tires were put on and balanced. It really wasn't out that bad at all. I will have them do an alignment again in a few months. Going in the shop tomorrow so I'll keep everyone updated. I have a list of things for them to check. (rear tire re-balance - wheel bearings - brakes - motor mounts - drive shaft - carrier bearings - prop bolts) Thank you all again.

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