rtz - compatible with chevrolet gmc sierra silverado 1500 99-06 pickup truck lift kit 6" front iron lift spindles & lift coil spacers + 4" rear lift block kit + rear dt 9000's nitrogen gas shocks 2wd rtz this rtz lift kit will lift your 1500 series pickup up to 6" on the front and 4" on the rear. the front spacers are bottom mounted to your 2wd coils springs, seat into your lower control arms and are made of solid aluminum. the actual height of the front spacers is less than the actual height of lift once installed and is based on a 2 to 1 lift ratio. the iron spindles are a 3" lift and is made of ductile iron that has been precision machined. our rear gorilla steel blocks are tapered for pinion, powder-coated to prevent rusting, will never break and guaranteed to last! zinc plated grade 8 ubolts and hardware included. to compliment the lift kit we will include a set of doestch tech nitro gas shocks which will add to increased control, stability and drive ability while adapting to unexpected changing terrain. note:please inspect parts before beginning installation. we suggest a professional installer with proper equipment to handle extreme loads and that has training in suspension safety.