Slight "thud" on moderate accel from standstill
- Thread starter Bucky1
- Start date
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swathdiver
Full Access Member
Visually and checking for movement, or too much movement. The bolts go through rubber bushings.
my drivers side one looked almost like it was dry rotted (when it was out), must be from the heat
Check the Trans mount... I have had cars do this, the trans would bump the bottom of the tunnel when the rear trans mount went bad... I have had the mount look perfectly, but then take a board and try to lift up on the trans and it would separate.
Really hard to tell what is normal for the AWD partially because it has no park and simply binds against it's self
Jolly Roger
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...maybe a dumb idea, but could the sound be from the gas tank wall popping out with gas moving to the rear when you accelerate? Does the noise happen on a empty tank or full tank?
Full or empty the same.
Looked at that I think on page two. Movement seems within reason. Does not look broken.
I have had various causes for clunks when taking off from a stand still, most of which have been mentioned here.
With 130K, it could very well be a front shock. That’s close to when my front shocks have out on my ‘07 XL Denali. I would also inspect your drive axle as the boots like to split and let all the grease out.
With 130K, it could very well be a front shock. That’s close to when my front shocks have out on my ‘07 XL Denali. I would also inspect your drive axle as the boots like to split and let all the grease out.
kbuskill
***CAUTION*** I do my own stunts!
There is no "air ride" up front, only on the rear if you have the "auto leveling" rear suspension RPO code Z69.
However all 4 shocks/struts are electronically dampened if you have the "autoride" suspension RPO code Z55.
There is also "Magnaride" suspension but the RPO code escapes my memory at the moment. But James @swathdiver knows.
If it sounds like it is coming from the front it could be a bad spring isolator allowing the spring to pop and make noise... a bad upper or lower control arm bushing... a bad sway bar end link or bushing.
However all 4 shocks/struts are electronically dampened if you have the "autoride" suspension RPO code Z55.
There is also "Magnaride" suspension but the RPO code escapes my memory at the moment. But James @swathdiver knows.
If it sounds like it is coming from the front it could be a bad spring isolator allowing the spring to pop and make noise... a bad upper or lower control arm bushing... a bad sway bar end link or bushing.
swathdiver
Full Access Member
Z95 with G69
avalonandl
Full Access Member
My AWD 2011 Denali (134k miles) does the exact same thing- not all the time.
Its not the motor mount because I did the throttle blip with hood up- ZERO movement.
Its not the motor mount because I did the throttle blip with hood up- ZERO movement.
09_4WD_YUKON
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I think I have the same thing as you, but have not checked mine out. I also think someone on here mentioned checking the rear trailing arm bushings.
CrashTestDummy
Full Access Member
At >100K miles, if you haven't replaced a motor mount, it is the motor mount. AND in the outside chance it is not, it soon will be, so replacing the driver's side motor mount with the Hummer mount will be money well spent.
Rob Haag
TYF Newbie
Mine turned out to be rear control arm bushings, I had a rattle with it too, over the slightest bumps, that drove me crazy. I had to move my axle just a bit when I installed the new trackbar, all the bushings back there were worn. Thux and rattle is gone now, I originally thought it was u-joints or transfer case
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