− Decrease quantity for Shocks Bilstein Shock Box - 6 inch lift kit - 1999-2010 GM 2500/3500HD 4WD, 1999-2010 GM 1500HD and 2500 Non-Heavy Duty 4WD Quantity + Increase quantity for Shocks Bilstein Shock Box - 6 inch lift kit - 1999-2010 GM 2500/3500HD 4WD, 1999-2010 GM 1500HD and 2500 Non-Heavy Duty 4WD Add to cart