anyone aware of any spring, shock or rear end issues with these? if I go over a hump while turning loud clunk from I think right rear, almost sounds like something fell over in the bed.

I have a 2014 and a 2017 GMC...they both clunked...dealer greased between leaf springs on the pads in front and rear and it quit. Both trucks also have clunk in drive shaft also...they replaced the 2014 driveshaft and will be doing the 2017 next time in. Lifetime warranty on drivetrain on both trucks. 2014 6.2 litre dropped a valve at 42000 miles...they replaced the entire motor.

Cant ***** when it's free repair is my thought.

How did you get lifetime warrantee on driveline?

Thru the dealer...all service is done thru dealer and lifetime warranty follows.

Demontrond GMC Houston