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Rear End Clunk

turbowilson

By turbowilson
in Ask A GM Technician

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turbowilson New Member

turbowilson

Posted
Posted

I have owned my new 2008 Silverado 4X4 crew cab for about a month now. I notice, most of the time, when I accerlerate from a stop, I hear and feel a "clunk" coming from the rear of the vehicle. Any idea what this is?

thanks,

Robert

dayday Enthusiast

dayday

Posted
Posted
I have owned my new 2008 Silverado 4X4 crew cab for about a month now. I notice, most of the time, when I accerlerate from a stop, I hear and feel a "clunk" coming from the rear of the vehicle. Any idea what this is?

thanks,

Robert

I've got the same issue ('08 Sierra CC Z71).... Mines going in the shop Friday, I'll let you know what they say.

TexasAl Enthusiast

TexasAl

Posted
Posted

I have it too. It really only happens when I decelerate quickly, so I am thinking it might be something with the rear drum breaks.

 

-Al

yellow z71 Enthusiast

yellow z71

Posted
Posted

I had this on my 03 Silverado and my 04 Z71 suburban. It seemed worse on my Suburban, I can't rmember what the Tech called it but there is a bulletin out on it and it is considered by GM to be normal in all light duty trucks and SUVs and is more pronounced in 4WD vehicles. I noticed it when accelerating and decelerating. It was especially noticible when I was driving through neighborhoods or parking lots.

dayday Enthusiast

dayday

Posted
Posted
I had this on my 03 Silverado and my 04 Z71 suburban. It seemed worse on my Suburban, I can't rmember what the Tech called it but there is a bulletin out on it and it is considered by GM to be normal in all light duty trucks and SUVs and is more pronounced in 4WD vehicles. I noticed it when accelerating and decelerating. It was especially noticible when I was driving through neighborhoods or parking lots.

I have the driveline slack noise.... But this is different, I'll let you know what they say Friday. Mine pops, like the springs are binding or something.

TexasAl Enthusiast

TexasAl

Posted
Posted
I had this on my 03 Silverado and my 04 Z71 suburban. It seemed worse on my Suburban, I can't rmember what the Tech called it but there is a bulletin out on it and it is considered by GM to be normal in all light duty trucks and SUVs and is more pronounced in 4WD vehicles. I noticed it when accelerating and decelerating. It was especially noticible when I was driving through neighborhoods or parking lots.

I have the driveline slack noise.... But this is different, I'll let you know what they say Friday. Mine pops, like the springs are binding or something.

 

 

Only after you come to a stop and then let go of the brake to accelerate correct?

 

-Al

dayday Enthusiast

dayday

Posted
Posted
I had this on my 03 Silverado and my 04 Z71 suburban. It seemed worse on my Suburban, I can't rmember what the Tech called it but there is a bulletin out on it and it is considered by GM to be normal in all light duty trucks and SUVs and is more pronounced in 4WD vehicles. I noticed it when accelerating and decelerating. It was especially noticible when I was driving through neighborhoods or parking lots.

I have the driveline slack noise.... But this is different, I'll let you know what they say Friday. Mine pops, like the springs are binding or something.

 

 

Only after you come to a stop and then let go of the brake to accelerate correct?

 

-Al

 

The "slack" noise is at low speeds when you get on and off the gas like cruising through a parking lot and also starting and stopping.

 

My popping noise has disappeared now that the weather has warmed up a bit and it started raining. If it's not doing it Friday I guess I'll have to cancel the trip to the service department since we all know if they don't hear it, it doesn't exist...

Spurshot Senior Enthusiast

Spurshot

Posted
Posted

Pull the rear driveshaft and grease the splines of the yoke with a good synthetic chassis grease (Mobil 1).

  • 3 weeks later...
dayday Enthusiast

dayday

Posted
Posted
My popping noise has disappeared now that the weather has warmed up a bit and it started raining. If it's not doing it Friday I guess I'll have to cancel the trip to the service department since we all know if they don't hear it, it doesn't exist...

 

Just a final update on mine. The noise never returned until the temp dropped back under 10*F. So I guess it's safe to say it's cold weather related and I will just live with it. I just can't tell if it's the leafs or the body mounts.

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