cluck issue

[chain]

First off I want to say I did search it and the information I found seems to point to earlier models.

I am driving an '09 Coupe and it has the clunk. It does it when I hit the gas and does it again when I let off of the gas. I did buy it "certified pre owned" so I do have a 12 month warranty on it which I plan to use after the snow is gone for the winter. Any ideas? Initial thoughts tell me it has to be something lose with how the rear end is held into place.

[glake89]

There is a bushing on the diff that can fail.

[GMCustomerSvc]

Originally Posted by chain First off I want to say I did search it and the information I found seems to point to earlier models. I am driving an '09 Coupe and it has the clunk. It does it when I hit the gas and does it again when I let off of the gas. I did buy it "certified pre owned" so I do have a 12 month warranty on it which I plan to use after the snow is gone for the winter. Any ideas? Initial thoughts tell me it has to be something lose with how the rear end is held into place.

Sorry to hear you're having a noise issue. Let us know when you decide to take it to the dealership. I hope all is well considering. Have a great New Year!

Matt,

GM Customer Assistance

[King-Oka]

If you're having a cluck issue, I'd guess you have a chicken under your hood

[chain]

Lol, yeah I just noticed I typed "cluck" rather than "clunk" on the thread title. Made me laugh too.

[rob the elder]

No mersy from da phorum diction police

[Dave@ddmworks]

Originally Posted by chain First off I want to say I did search it and the information I found seems to point to earlier models. I am driving an '09 Coupe and it has the clunk. It does it when I hit the gas and does it again when I let off of the gas. I did buy it "certified pre owned" so I do have a 12 month warranty on it which I plan to use after the snow is gone for the winter. Any ideas? Initial thoughts tell me it has to be something lose with how the rear end is held into place.

Is your car a manual or an automatic?

If it is an auto there is the bushing in the back on the differential that could be causing the clunk that you are hearing when loading the drivetrain and unloading it. This is a common noise on the earlier cars, especially the 2006's. If you have a manual, the 2009 cars all had a torque arm that attaches the transmission directly to the differential and would look at other areas.

Dave

[chickenwire]

Originally Posted by King-Oka If you're having a cluck issue, I'd guess you have a chicken under your hood

Saw "cluck" and chicken came running! Sorry you're having an issue with the car, just glad one of my brethren didn't end up under your hood!

[DaveOC]

The clunk is usually a manifestation of what are known as "tolerances". Whenever a part is manufactured, it can be tight on a tolerance or loose. Every so often, a transmission will be produced where all the parts are on the loose side, such that you can turn the tail shaft more before it tightens up than would be "normal", despite all the parts in the transmission being within tolerance.

The same can happen with the differential.

When you get a loose transmission paired with a loose differential, you have more clunk than when you have a tight transmission and a tight rear diff.

All cars have clunk to some degree. In many cars it is not noticeable because of sound deadening and further distance from the drivers seating position.

In our Solstices we sit right next to the transmission and drive shaft, and quite close to the differential. For that reason, the clunk is more noticeable.

As a practical matter, there is very little a dealer can do to reduce clunk, short of replacing either the transmission or differential, or both. It is quite possible to have one or the other replaced and end up with more clunk than what you started with.

.

[chain]

Mine is an auto. I will be taking it to the dealer in the spring. My clunk is very noticable and I am fairly confident they can only make it better.

I guess I should be careful talking like that when it comes to a dealership lol.