4wd clunk

[bry2500]

Each time I drive in 4wd i hear a loud clunk, mostly during slow tight turning but also sometimes just when starting to move straight ahead.almost sounds like a u joint but super loud. I have checked every thin out and all seams tight and not worn. I know whata cv joint sounds like when it's going and this definitely is not a cv joint. I has almost a ping noise to it like if you were to push a dent out of sheet metal. Any thoughts?

also it is mostly when driving in reverse and turning.

[GaryL]

4wd's don't like to turn tight when in 4wd, especially on dry pavement. A clunk in those situations is normal, but try to avoid them because it will damage the transfer case. The noise you hear when just starting out could be a little play in the transfer case. Someone else can probably help you some more.

[MrShorty]

Sounds like the 4wd binding up and releasing. Normal in 4H/4L on a good traction surface, though it does indicate that something will likely break if you continue the practice. 4H/4L should only be used when traction is poor enough to allow the wheels to slip.

I had a truck do something similar when I had mis matched tires (same size but different manufacturer). The size difference between manufacturers was enough to cause the drivetrain to bind up and release with a clunk.

[bry2500]

Sounds like the 4wd binding up and releasing. Normal in 4H/4L on a good traction surface, though it does indicate that something will likely break if you continue the practice. 4H/4L should only be used when traction is poor enough to allow the wheels to slip.

I had a truck do something similar when I had mis matched tires (same size but different manufacturer). The size difference between manufacturers was enough to cause the drivetrain to bind up and release with a clunk.

I do have different manufacturer tires, they are the same size but the rear look a smidge smaller. I thought it was an optical illusion because of the front end rake on the avalanche. Looks like I have to find 4 new tires. Thanks for the quick replies guys.