Clunking Noise Question

[BigCuz]

I have 2 Yukon XL's, a 01 and an 05. On the 01, I am starting to hear the transmission make a clunking noise ad I put the car in reverse or Drive. I still have a warranty from the dealership I purchased it from. Took it in to them, they replaced the torque converter and reaction shell. Now, the shop manager gave a printout from ALLDATA as he explained it is a known issue in 2012 and prior Gm cars, and trucks. Now, my questions to him was, it has never done it before, as well as I have a 05 and it is not doing so. Is anyone else experiencing this problem?

 

[ATL]

mine does that bs on startup. twist the key and as the engine fires up, the transmission clunks like it just had a load applied to it

 

[My01yuk]

I have an 01 yuk and it does this too. I have had the tranny and transfer case looked at. They both checked out fine. I mainly notice it when taking off after slowing down like at a yield sign etc. Doesn't do it all the time.

 

[eagledax]

Check your U-Joints and make sure those aren't going out. I had the same problem with one of my older suburbans and after replacing the U-joint the clunk went away.

 

[Freedom Motorsports]

Chevy driveline slack is what they use to call it...

 

[Kman]

Pack the drive-shaft where is enters the transmission with grease. They make special grease for this. The clunk will be gone for about a year before you have to reapply.