squ1rrl

that is correct i have the 2020 sierra slt and it has the 10 speed

i have the same issue. i am changing over to the gabriel or monroe air shocks or the rancho shocks the are adjustable with 9 settings

stock 2020 gmc sierra slt with the x31 package, only 3-4" clearance from axle to bumper on the frame, 30 miles hits the faster you go the harder it hits

2020 gmc sierra 1500 slt with x31 package all stock vehicle. there is only 3-4 " clearance between the axle and the bumper above the axle. speed maybe from 40 and up, the faster you go the harder it hits.

stock 2020 gmc sierra 1500 slt with x31 package, set bottom out on the axle going over small bumps in the road only 3-4" clearance from axle to bumper on the frame. speed 30 bottoms out the faster you go the harder it hits.