Shaking at specific speeds and burning smell

[FunnyRS]

Hello all,
My 2011 LT RS has lately been shaking a bit while I'm driving. It gets so strong the steering wheel also shakes in the 35-50mph and 65-80mph ranges. The specific speed that I feel the shaking the most changes within those ranges every day. Also, before I noticed the shaking, I noticed an occasional very strong burning smell that seems to come and go whenever it wants and I can't identify where it's coming from.

Sent to Firestone for wheel alignment, rotation, and balancing. Sent to another shop who said all they saw was cupped tires and a botched alignment job. Shaking and burning smell persists.

List of symptoms:
-Shaking, strongest at random speeds between 35-50mph and 65-80mph in all gears.
-Occasionally a very strong burning smell.
-Faint, brief squealing sound under hard acceleration between gears 1-3.

Any ideas?
Thanks!

[chevy pilot]

Shaking can be drive shaft or CV axle.

Cupped tires ?
Can be tire frame failure,how old are tires ?

[bsn]

Cupped tires will absolutely cause shaking, usually a sign of worn out struts or tires way out of balance. If your alignments is bad enough you can scrub the tires and smell burning rubber-should be obvious looking at the tire wear. Have you hit a curb or pothole recently. I would suspect bent or worn suspension-a shop should have refused to attempt to align the car without replacing the tires and finding the damaged part. I would deem the car unsafe to drive anywhere but to a repair shop until its fixed.

[FunnyRS]

Not sure how old the tires are, got the car 6 months ago with them already on it and they're definitely not originals.

[FunnyRS]

Originally Posted by bsn

Cupped tires will absolutely cause shaking, usually a sign of worn out struts or tires way out of balance. If your alignments is bad enough you can scrub the tires and smell burning rubber-should be obvious looking at the tire wear. Have you hit a curb or pothole recently. I would suspect bent or worn suspension-a shop should have refused to attempt to align the car without replacing the tires and finding the damaged part. I would deem the car unsafe to drive anywhere but to a repair shop until its fixed.

I did nudge a snowbank recently, which was immediately before the shaking started. I had that in mind when I went for the alignment. Going back to Firestone on Monday to take advantage of the alignment warranty, and I will also ask them to check the suspension. Thanks!

[RACERJOE1]

If you haven't already found the problem, I would have the brakes checked, the symptoms you describe sound exactly like stuck brake caliper/piston.

[0stones0]

Originally Posted by RACERJOE1

If you haven't already found the problem, I would have the brakes checked, the symptoms you describe sound exactly like stuck brake caliper/piston.

^^^^^
Went through this with another vehicle some years back. Look at the rotors and see if bluing is occurring.

[hesster]

Steering Wheel shaking indicates a imbalance condition in the drivetrain. Most likely Tire/Wheel Imbalance (lost a wheel weight?), warped Rotors, or alignment way out of spec.
Key input is you 'nudged a snowbank". So you nudged your suspension, T/W, or Alignment enough to start the vibration .

[chef-beavis]

Could have ice in the barrel of the wheel.