2011-2022 Chevrolet/GMC 2500/3500HD RWD, 4WD 2'' Rear Block Kit for use with Factory Top Overloads Injectors 2010-2012 Cummins 6.7L The active fill bucket eliminates

The active fill bucket eliminates the need for tank sumps

Bump stop mount extensions

Front and rear sway bar mount drop spacers

spring loaded cylinder and pressure regulation provides up to 150 retarding horsepower throughout the engine's RPM range - not just at high rpm like some designs that use holes or additional parts and claim it as a better idea

2011-2022 Chevrolet/GMC 2500/3500HD RWD, 4WD 2'' Rear Block Kit for use with Factory Top Overloads Injectors 2010-2012 Cummins 6.7L The active fill bucket eliminates2 inch rear lift 2 & 4WD 2500HD single rear wheel with factory trailer package springs 3500HD dually OEM style cast iron construction Kit includes: pair of rear lift blocks Extended U bolts and hardware