Its very common to lower the front of these trucks using Dakota spindles for 2" , B100 Van lower control arms for 2", Or both for 4". On the rear you have guys flipping there front hanger and running a belltech GM Shackle for roughly 4.5" or flipping the axle onto top of springs for 6-7 inches. Theres a ton of info on
www.MOPARTS.com.