Question about 2007 GMC Sierra 3500HD

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Hi: My 2010 GMC Sierra has small vibration at speeds of 20 to 40 miles per Hr. It show up in the steering wheel and sometimes makes a louder vibration noise for about 10 seconds. The gm garage has not been able to find the problem so far. What do you think it is and what could be a solultion Thanks, MIKE

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  • gfdltd Apr 18, 2011

    Hi
    Thanks for info on AFM. Is this what gm has told you? You say you have the same truck with the same issue, and nothing can be done about it! Thats horrible!
    Mike

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  • GMC Master
  • 17,970 Answers

Allways been bad U-Joints, or a bent drive shaft that has caused the drive shaft to vibrate between such speeds.

Does it shake when accelerating hard up to 50mph? If you aren't getting any shaking in the steering wheel, and it feels like it is coming from the front, then it sounds like bad axles (mainly bad inner CV joints).

Try rotating the tires back to how they were before the shaking started, and see if it changes (not likely if there's no shaking in the steering wheel). Check this fault in two sample video:

Sample 1


Sample 2


Another thing, check all the suspension bolts you undid to change the coilovers. Make sure everything is tight. Did you neutralize all your suspension bushings before tightening the bolts? If not you could be getting bushing bind. To neutralize suspension bushings: loosen the suspension bolts, load the suspension (either the car sitting on the ground or the jack stands holding the car up by the suspension not the lift points), tighten the suspension bolts.

Keep us updated.

Posted on Apr 07, 2011

  • ZJ Limited
    ZJ Limited Apr 07, 2011

    I really dont know if this comments work for your vehicle, but coudl be interesting pay attention...

    Its a normal condition with AFM. I notice it in my GM 2010 and did in my 2008. Some peoples perception of very slight vibration may not agree with others. I know it bugs me to no end. Shift into the manual mode M5 and AFM won't engage.

    TSB 06-06-05-001C
    "Some customers may comment in a change in the exhaust note or tone when an Active Fuel Management System equipped engine is in 3 or 4 cylinder mode. Some drivers may also notice a very slight vibration in either the accelerator pedal, floor pan, and/or the steering wheel. This is a normal condition for Active Fuel Management System equipped vehicles and no repairs should be attempted."[/b]

    Customer Information on Active Fuel Management
    When the Active Fuel Management System is enabled, physical changes take place within the engine that allow it to run as a 3 or 4 cylinder motor with accompanying additional fuel savings. The change in exhaust tone is expected as all sound from the exhaust is the result of combustion in the engine. The ability to perceive these changes in sound are kept to very minimal levels as the Active Fuel Management System is only activated during a steady state/near steady state driving or during coast down. In both of these situations, the load on the engine is minimal and general exhaust volume (sound) is low.

    You may give a copy of this bulletin to your customer or ask about this with your dealer..

  • ZJ Limited
    ZJ Limited Apr 18, 2011

    Yeasm its a insane thing, You have reviewed all the items I mentioned previously?

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