I got some 2" drop shackles installed about 2 months ago or so and sometimes I look at the truck and it doesnt look even. Is there a sure way I can really find out like use a measuring tape? I was looking at them and it looks like the bolt in the shackles could drop down another notch...

 

park the truck in your garage then measure the distance to the ground from several points before the back tire and up close to the front. They should all be very close to the same. be careful not to measure in places where the bottom of the body changes.