Introducing the ReadyLIFT 8" Big Lift Kit for 2019-2021 MY Chevy Silverado and GMC Sierra 1500 trucks! This kit is engineered for exceptional ride quality and superior handling performance. It's important to note that it is not suitable for Trail Boss AT4 AT4X ZR2 or Denali models and incompatible with Adaptive Ride Control or Multimatic ¾ suspension. Additionally it won't work with vehicles equipped with rear composite mono-leaf springs; instead it's designed for those with traditional steel leaf springs featuring square U-bolts. The kit includes boxed steel front/rear cross members and a full-width front skid plate made of 3/16" plate steel. The differential drop brackets are constructed with 1/4-inch boxed plate steel featuring double gussets and a boxed center rib to handle front differential torsional twisting. The lower strut extension in a clam-shell style retains factory struts without requiring rotation and uses TCT lower bushings for a precise pivot point. Tubular upper control arms with TCT pivot bushings add strength to the upper control arm. The rear is lifted with 5" tall fabricated steel rear blocks an add-a-leaf and Bilstein 5100 series rear shocks. With extensive engineering and testing this kit offers an improved ride compared to stock. It accommodates up to 37x12.50 tires on 8-inch kits with 9" wide wheels (no trimming) and with minor trimming it supports 20x10 -18 offset wheels with the same tire size. It maintains factory ride and handling delivers increased clearance for aftermarket tires and includes features like a maintenance-free pivot bushing 3/16-inch thick steel cross members and a powertrain warranty for peace of mind. This Big Lift Kit is the ultimate choice for enhancing your 2019-2021 GM 1500 4WD truck's performance and style.