Bump Backing Up

[daviddsims1]

I just bought a used 2014 GMC Sierra 4x4 SLT with 66k on it and was certified used. So far I love the truck and made sure there was no shake or other issues commonly associated with this model. One thing I noticed was when I back up, sometimes there is a slight bump after its in reverse and already backing up coming from drive shaft or rear end. It's really difficult to say but something certainly feels like it catches and makes a bump sound just very briefly. I have a complete warranty for a year and will be taking it to dealer just curious if anyone else has experienced this?

[Brad8899]

I'm experiencing the same thing! I have a 2014 Silverado LTZ 4X2 with 74k mile . Every time I back out of my driveway I hear a knock. Makes me think I'm backing up over somthing. I also thought it was the driveshaft.

[Powerlines]

My 16 does the same but haven't looked too much into it yet.