Can someone tell me the torque specs for the rear leaf spring u bolts & shocks on a 2021 Sierra 1500 Denali

Are these new or used?

Factory truck only has 6000 miles on it. I just recently started hearing a slight thumping underneath & that was one of the solutions I found was to re-torque the u bolts, but I don’t think that’* going to fix it. It’* not a clanging or squeaking noise

Is this warranty? If so, don't touch them and take it to the dealer.

What Mike said ^^^^^^^

. . . and make sure you replicate the issue with a technician on board.