Tuff Country P/N 97030 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 2.5 Inches (Replaces factory block)
• Maintains a factory ride
• Custom made for the application
• Lift blocks are constructed of heavy duty cast iron
• Blocks are tapered to eliminate or reduce driveline vibration
• Zinc plated corrosion resistant extended u-bolts
• Simple Bolt-on Installation
• Made In The USA
• Sold As A Kit

Fits:

• 1999-2005 Chevrolet Silverado 1500 4WD
• 1999-2005 GMC Sierra 1500 4WD

Installation Notes:

• Included 4 inch blocks replace the factory 1.5 inch blocks
• 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: 2.5 Inches Rear Lift (Replaces rear blocks)
• Blocks Tapered: Yes
• Lift Block Dimensions: 4 Inch H x 2.5 Inch W x 4.75 Inch L
• U-Bolt Dimensions: 9/16 Inch x 2.75 Inch x 12.625 Inch - Square
• Includes: 2) 4 Inch Cast Iron Lift Blocks, 4) Rear Axle U-bolts, 1) Hardware Bag (nuts and washers)