Well that might explain it. Installing collars changes ride height, which can cause noise from the control arm bushings. When any lift is installed the upper and lower control arm bushing bolts should be loosened and retorqued with the weight of the truck on the suspension to eliminate any binding.I had a feeling I posted this is the wrong thread. Wasn’t sure if they were somehow tied together.
Truck has 1.5 collars installed. Other than that, it’s stock.