Extended Notes: 1. Measure rear axle tube before ordering. Some 4" axle models with dual overloads will require 4068. 2. Rear lift options will not fit dually applications. 4. 102009 Rear brake lines will not fit 2012 models. 5. Kit will also work on gas models. But will require coil springs (032601) and spacer (012201) in place of coil springs (032801). 6. Additional front driveline modification may be required. 7. Exhaust modification will be required for dual rear shock kit 122009.