Bucking/Clunking at takeoff?

chip · Apr 6, 2026

Hello all,

On my 2010 6.2 AWD, I have a bucking/clunking coming from what feels like the driver's side front when I takeoff from a stop. The harder I takeoff, the more noticeable it is. When I say "takeoff", I mean regular driving (not WOT). It feels like the front/left axle is bucking, but there isn't any obvious noise. I originally suspected motor mounts, but those have been replaced. Is there a suspension and/or drivetrain component that I should be looking at? Has anyone had this issue and resolved it?

Thanks in advance.

Joseph Garcia · Apr 7, 2026

Check you front drive shafts and CV joints for any noticeable play. If you can't identify and visible issues, then do the following.

I recommend that you take the truck to a trusted local repair shop, and get the truck on a lift with the wheels off the ground and with someone inside the truck. Put the truck in gear and press the gas pedal a bit, and see if the noise also occurs in the unloaded situation (wheels off the ground). If the noise still occurs, then the Mechanic underneath the truck can go around, with a stethoscope if necessary, and locate the source of the noise.

09_4WD_YUKON · Apr 16, 2026

Check the motor mount?

mikez71 · Apr 16, 2026

He said he replaced motor mounts...

Maybe the front diff bracket? Especially being AWD..

Fless · Apr 16, 2026

Crossmember bolts have been known to get loose. Check and torque to specs.

rdezs · Apr 16, 2026

Front differential mounts...

chip · Apr 18, 2026

Front diff mount is sounding very likely. Thanks for the input! I appreciate you all.

Joseph Garcia · Apr 19, 2026

I had clunking, but no bucking. I replaced my front differential mounts, and the clunk disappeared.

rdezs · Apr 19, 2026

That front differential rocking on the mounts makes a hell of a clunk...

Bucking/Clunking at takeoff?

chip

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Joseph Garcia

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09_4WD_YUKON

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mikez71

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Fless

rdezs

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chip

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Joseph Garcia

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rdezs

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