I have a clunk in my 2005 (5.3)silverado rear end. Have had the noise since I bought the truck. The Chevy Dealership couldn't duplicate the noise but I still can hear it when I drive through town and it shifts or after I apply gas from coasting. What could be the cause?

sounds like hub has failed

2005 TrailBlazer Clacking and Clunking From Rear End ...

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https://www.youtube.com/watch?v=HIA151KxImM
Mar 14, 2013 - Uploaded by sameasiteverwas122
2005 TrailBlazer Clacking and Clunking From Rear End ...Trailblazer clunking noise over bumps (the number 1 and 2 ... How To Find Suspension Noises 101 - EricTheCarGuy - Duration: 23:57. by EricTheCarGuy 1,497,067 views ... How to Install a Water Pump: 2002 - 2009 Chevrolet Trailblazer 4.2L L6 ...

Trailblazer Driveline Noises Discovered - YouTube

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https://www.youtube.com/watch?v=GLhTUoHWdNM
Nov 4, 2013 - Uploaded by Roland Caston
the Trailblazer has developed some nasty noises. ... loose in thedifferential and the right front strut has torn through it's bushing.... How To Install Replace Front Axle Disconnect Housing 2002-09 GMC Envoy Chevy Trailblazer ... How Much Abuse Can a Trailblazer Take Part 2 : How to Replace a Rear Axle ...

Noise coming from back on trailblazer - YouTube

how many miles on truck?

I have the same problem with my 05 with 75,000 miles. With mine brake dust builds up in rear drums and causes sticking. Remove rear wheels and drums and clean everything with brake clean. I do it every 12 to 16 months and solves the problem.

the gears in your rear end are probably chipped and broke or need shims

Tranny, drive shaft, rear end,

Sounds like a bad ujoint.

I would suggest a rear differential service. When the fluid breaks down in the rear it doesn't provide the proper lubrication for the rear and you'll hear the "moan". Don't forget to buy and add the limited slip(posi-trac) additive.

As far as the rear end noise, There was a TSB released on GMC light duty trucks that says "Some owners of light duty trucks equipped with automatic transmissions may comment that the vehicle exhibits a clunk noise when ******* between Park and Drive, Park and Reverse, or Drive and Reverse... Whenever there are two or more gears interactin with one another, there must be a certain amount of clearance between those gears in order for the gears to operate properly. This clearance of freeplay (also known as lash) can translate into a clunk noise whenever the gear is loaded and unloaded quickly, or whenever the direction of rotation is reversed." It goes onto say "...Whilse some owners may find the clunk objectionable, this will not adversely affect durability or performance."

remove the drive shaft press out the old u joints auto zone rents the tool 4 that makes the job easy

The noise is caused by the axle button being worn out, this lets the axle move back and forth and clunk, this is a unique problem with C clip retained axles, it is a noise issue but will not fail and cause any more damage, in order to fix it you must have the axles pulled and the diff carrier checked for excess wear where the axle retainning C clip rides, if the carrier is ok then replace the axles.