Rear popping noise !!

[Hummertech]

This has been talked about before, but a click or pop noise on sharp turns when the body flexes is usually caused from the front crossmember. There is a bulletin for this, take it to your dealers and tell them to quit being a disgrace and fix something for a change.
If you want to see if that is it yourself, bet underneath it with an 18mm wrench and a socket and tighten the 4 bolts about 1/4 turn. You may need to use a cheater pipe because it's hard to get good leverage on your back like that. If you hear the bolts pop as you're tightening them, they we're not tight enough.