Skyjacker 2011-2017 GMC Sierra 3500 HD 4 Wheel Drive Suspension Block and U-Bolt Kit tie down straps The Spec Series is compatible

The Spec Series is compatible with the factory hitch and also includes a high clearance trailer wiring mount

7L cold air intake (CAI) feeds your engine more air than the factory intake

One-Way Clutch HD Upgrade

Covers come with new gaskets and sold separately or in a set of six

Skyjacker 2011-2017 GMC Sierra 3500 HD 4 Wheel Drive Suspension Block and U-Bolt Kit tie down straps The Spec Series is compatibleSkyjacker(R) utilizes Blocks and U Bolts in its Kits to provide rear lift. The Skyjacker(R) U Bolts are e coated for corrosion resistance. These U Bolts are offered in various shapes and sizes such as square, round, and semi round in lengths ranging from 1. 75 19 inches. The Blocks used in Skyjacker(R) Kits are Ductile iron with fixed center pins. They are also tapered to correct pinion angle and prevent driveline vibrations. Available in 1. 25, 2, 3.