Noise coming from rear underneath Tahoe

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ALVTAHOE

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I recently bought a 2003 Tahoe LT with 125k miles. The truck is real clean and well taken care of, but recently it started making a random noise it doesn't happen all the time and when it does happen it usually makes 1 or 2 popping/hitting sounds and it only happens when I'm driving forward usually faster than 30 mph. It sounds like something popping up and hitting the floor board near the rear. I have had the u joints and they seem to be in good shape. I also looked at the exhaust and everything seems to be normal here also. The noise travels so to me it seem like its coming from the rear. Does anyone have any ideas or guesses as to what this could be?
 

h8nbmps

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I had almost the same noise loud clunking thought rear went bad turned out to b the parking brake assembly fell apart and you could hear it at low speeds
 

bossku69

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Does this happen in 2WD versus 4WD?

I may be way off, but could be something related to your rear drive shaft when the car is shifting into higher gears and it's actually just something "shaking" as a result of transmission shifting.

I only throw that out there because same thing was happening with my BMW which is RWD and the flex disc was bad, so when it would shift into 3rd and 4th gears, it would make a "CLUNK" sound, like a squirrel was banging under the rear of my car with a hammer.

Stealership said the whole back end needed to be removed and examined, then they would start to diagnosis. I found the issue online from other German cars then had a body shop replace the part for $300.
 

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