I recently put torsion bar keys on my truck to level it out but i've been hearing that i need to watch how much i crank it. I want to get an add a leaf to raise the rear but I want to know if its possible to over crank them with the keys in there or is that just for people who don't have the keys

2001 Silverado z71 x cab

 

If you crank the keys too much you will have the upper A arms hitting the bottom bump stops, makes for a stiff ride and an annoying noise every time the hit the stops.