Heavy duty CNC cut 3/16" thick steel under bed C notch frame kit for Chevy/GMC Silverado/Sierra from 99-06 & 07 Classics.  Adds 3.75" of frame clearance for your 5-7 inch drop with no cutting of the bed.  Ships flat with bend relief cuts ready to weld.  

Check out Lawrence Tolman installing our notch on his 4x4 drag truck!  https://youtu.be/CPetqwESSa4