https://www.youtube.com/watch?v=31TIpg9kq-k&feature=youtube_gdata_player
ok, wrote for a half hour and it disappeared. I will edit later, when I have more time, but in a few words, the noise you hear at 07 seconds is when setting the cruise control at about 65 mph and faced with a hill, the transmission shifts to 5th and rpm jumps to 1800. No hill, no noise. Even if I shift manually to 5th. Happens also in awd or if I push the tow button too. Please help.

 

https://www.youtube.com/watch?v=31TIpg9kq-k&feature=youtube_gdata_player something isn't right with the link, but the post on youtube reads : 2012 Chevy suburban noise. What is it?

 

It looks like it could be a bad u-joint, due to the vibration that you are getting. Since your truck is still under warranty, you should make an appointment with your dealer and take a mechanic out for a drive with you.

 

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I’m sorry you are experiencing this issue. Have you had the vehicle inspected by your dealer for this issue?

Louis
GM Customer Service

 

I'm going there Tuesday morning, but have little hope that the tech could find an open road around here (nyc) to duplicate the noise.

 

I think any highway will do. You can get up to speed. Also the mechanic may offer to take it home.

 

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Please keep us posted of the results of your dealer.

Louis
GM Customer Service