Fabtechs 6" Suspension systems for the GM T900 platform uses Fabtechs industry leading crossmember and spindle technology. Fabtech pushes the envelope with superior ride height to properly clear 35" tall tires. Extensive design work was given to the extended length steering knuckles to keep the track width near stock with superior turning radius for maneuverability in tight spots. Lower control arm crossmembers are strengthened with cross tubes backed up by tubular frame struts to distribute front suspension impact loads. The front differential is protected with a tightly formed 1/4" thick steel skid plate. Rear suspension lift is accomplished via a block and add-a-leaf system. The Basic system features all the above componentry with a front coilover spacer system utilizing the factory coilover assembly for a stock like ride. This system has been properly designed to work with the factory Stabilitraka(r) safety functions without reprogramming the vehicles computer. Use up to 35/1250R20 tires w/ 20x9 wheels w/ 5a� BS w/ minor trimming. This product ships in approximately 1 days