GM Repair Problems? Ask GM Repair Expert Now.
Does the clunk seem to come from the rear of the vehicle, directly underneath the front seats or the front end?
And vibration on acceleration or steady speed above 45mph?
Ok, most likely the driveshaft rear ujoint is defective or less likely but possible is the rear differential pinion bearing.
This is most likely also causing the rattle in the tailpipe. The vibration will cause the tailpipe hanger to move and due to design where the tailpipe is very close to the rear axle it can hit it some and create the rattling sound
You will need to set up an appointment with the dealer and have them check the rear ujoint and the rear pinion bearing and replace as needed under the new vehicle warranty.
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