reverse clunking/vibration issue

[vettedreamer]

Hello looking for input or anyone experience this problem. I will do my best to describe. 2014 GMC 35.000 km 6.2l 3:73. 20 inch rims.First off the vibration issue when driving on the highway is getting frustrating, but i think that is a wheel tire issue but not sure. Now periodically when in reverse and backing up it almost feels like it is in 4 low with the hoping and grabbing grinding feel. i have to go forward and reverse two or three times before it reacts normal has anyone experience this

 

Thanks

[tnchevy]

Use the search function, already plenty of threads covering both of your problems.