Pennywise906

Hi, I would also be interested in the stl file if you are still willing to share! Much appreciated!

I agree 100%. I had an '07, '10, and a '12 that would be in 4-Auto from October through May and you would never know it. They took a big step back with the '14 and the supposed "square chain".

Yeah, mine was so bad I could feel it in the floor boards and the steering wheel, and my passengers could feel it in their feet as well. Now it seems more like you are describing yours, "nosier" but tolerable.

I don't think they actually changed the design (yet, at least)... I just think there is a big enough difference for certain tolerances on the internal parts. So two trucks off the same line on the same day could have some internal parts from a supplier that are on opposite ends of the tolerances and one could exhibit the behavior and might not. Just a theory from dealership and so far I have been satisfied with the swapped TC.

I had this as well (Stock z71 LTZ). GM sent an engineer up here to take a look as there were several from my local dealership having this issue. After the engineers report was sent to Detroit they replied with "It's due to a square chain in the transfer case (instead of rounded) creating 'noise,". And decided not to do anything about it. Good thing I have a good relationship with my dealer as they went the extra mile... had me take a fresh of the hauler z71 for a weekend to see if the problem existed on that truck as well. After driving it for the weekend and determining it did NOT have the vibration issue my dealer swapped my transfer case out for the one on the newer truck. Problem solved... but don't expect anything from GM themselves. I tried working through their customer assistance line and got nowhere. Your best bet is finding a dealer that will take the time to work with you.