Because you're lifting the truck at the same time . If you put on the bracket but didn't use a lift spring, then yes, the pivot of the radius arm wouldthat is BS...the bracket hangs down another 2-3 inches from what i can tell...how are you saying it wont decrease ground clearance? put a tape measure on it compare it to stock from the ground...
get closer to the ground. The brackets came in different heights. A 3", and 4" to be matched with a 3 or 4" lift