3rd gear clunk

[chris2323]

I have a 97 k1500 with a 4l60e. Whenever it shifts from 2nd to 3rd at a low rpm i get a clunk noise. If i floor it, the noise does not occur. Any ideas of what could be causing this? Im 100% confident that its not my u-joints because i just replaced them. Please help! Thanks

 

[ODaily]

Chock your tires, so you don't get squished by accident, then put it in neutral, crawl underneath and rotate the driveshaft forwards and backwards by hand. If it's the U-joints, or Rear-End, it should be pretty obvious and audible. Have a good look around while you're under there, Springs, shocks, tranny mount.

 

[chris2323]

Thanks for the reply. My trans mount is in good shape but there is quite a bit of rotational play in the driveshaft. How much is acceptable? The noise seems to be coming from the transfer case or transmission. Cant tell for sure