Tuff Country P/N 97021 block kit includes lift blocks and u-bolts designed to raise the rear of your GM Truck. Installation is done by inserting the cast lift blocks between the factory rear leaf springs and axle. Extended zinc plated rear u-bolts designed specifically for the GM Truck are used to replace the factory u-bolts.
Details:

• Rear Block and U-Bolt Kit
• Lifts the rear of your vehicle 1 inch
• Maintains a factory ride
• Custom made for the application
• Lift blocks are constructed of heavy duty cast iron
• Blocks are non-tapered
• Zinc plated corrosion resistant extended u-bolts
• Simple Bolt-on Installation
• Made In The USA
• Sold As A Kit

Fits:

• 2001-2010 Chevrolet Silverado 2500HD 4WD
• 2001-2010 GMC Sierra 2500HD 4WD

Installation Notes:

• On most applications factory length shocks must be replaced with extended length shocks when installing rear blocks 2 inches in height or taller
• Designed for rear axles only. Never use lift blocks with a front axle

Tech Specs:

• Amount of Lift: 1 Inch Rear Lift
• Blocks Tapered: No
• Lift Block Dimensions: 1 Inch H x 2.25 Inch W x 6.5 Inch L
• U-Bolt Dimensions: 5/8 Inch x 2.75 Inch x 12.875 Inch - Square
• Includes: 2) 1 Inch Cast Iron Lift Blocks, 4) Rear Axle U-bolts, 1) Hardware Bag (nuts and washers)