Leaf Spring U Bolt Rear Block Leveling Kit. SuspensionMAXX Rear Block and Leaf Spring U-Bolts - Lock Down Strength, Lift with Confidence. When it comes to your suspension, U-bolts are more than hardware - they're your connection to control and safety.

SuspensionMAXX Leaf Spring U-Bolts are engineered for maximum clamping force and long-lasting durability, whether you're upgrading leaf springs or installing a lift kit.

Why truck owners rely on SuspensionMAXX U-Bolts:

• Engineered for Lifted Trucks: Built longer and stronger to accommodate aftermarket leaf spring setups and blocks.
• Heavy-Duty Strength: Made from high-tensile steel for maximum holding power under load and off-road stress.
• Secure Fit, No Slippage: Keeps your axle securely fastened to the leaf springs - essential for safe towing and trail use.
• Corrosion-Resistant Coating: Withstands moisture, salt, and rough terrain to maintain integrity over time.
• Complete Kit Ready to Install: Includes hardened washers and high-strength nuts for a precise, secure fit.

Whether you're reinforcing your rear suspension or upgrading for off-road duty, SuspensionMAXX Leaf Spring U-Bolts deliver the strength and confidence your truck demands

Heavy Duty Rear Block and U-Bolt Kit 1.5 inch for 2020-2025 Silverado/Sierra 3500 (DRW) dually 2WD/4x4 w/ 3 inch Wide Leaf Springs. Features 3/4 inch diameter larger than stock Super Heavy Duty U bolts. For vehicles with top mounted overload springs.

The SuspensionMAXX SMX-156215 Heavy Duty Block and U-Bolt Rear Leaf Spring Leveling Kit increases rear suspension height by 1.5 inch, and is ideal for increasing ground clearance or fitting larger wheels and tires.

Fits 2020-2025 Chevrolet/GMC Silverado/Sierra 3500 DRW 4x4 and 2wd vehicles with top mounted overload springs.

Block and U-Bolt kits can also be used to level vehicles that carry heavy loads. SuspensionMAXX Heavy Duty Block and U-Bolt Kits are made with quality alloy metals for high strength and long life - they won't crack or compress.

The Super Heavy Duty U-Bolts are larger than stock and measure 3/4 inch in diameter. SuspensionMAXX includes all hardware needed and components are quickly installed using job specific tools. Installation involves no major alterations to the vehicle and the truck or SUV can easily be put back to stock specifications.

Made in America and covered under the MAXX Structural Lifetime Warranty.

SuspensionMAXX Heavy Duty Block and U-Bolt Rear Leaf Spring Leveling Kits are the perfect solution for lifting or leveling the rear of trucks or SUV's carrying heavy loads including campers. Such loads can cause rear suspension to compress and sag - thereby reducing rear ride height.

Our Block and U-Bolt Kits simply fit between rear leaf springs and axle to compensate for suspension compression and restore rear ride height.

SuspensionMAXX Heavy Duty Block and U-Bolt Rear Leaf Spring Leveling Kits utilize premium quality high strength components including CNC drilled and located solid steel blocks, heavy-duty Grade 8 U-Bolts, tall nuts and extra thick washers.

Installation can be done in about 1.5 hours and is supported by SuspensionMAXX Technical Support Program.

• Ideal for leveling or lifting vehicles, adding larger wheels and tires, or hauling heavy loads
• Available in a variety of lift heights to provide the inchjust right inch amount of rear lift for your needs
• SuspensionMAXX provides application coverage for the most vehicles and the largest number of height and configuration options per vehicle
• Strong and durable - Steel blocks, high strength u-bolts and fasteners
• Require no extensive modifications to the vehicle - totally reversible
• Excellent SuspensionMAXX customer service and technical support
• 100 percent American Made and covered by the MAXX Structural Lifetime Warranty

Applications

• 2020-2021 Chevrolet/GMC Silverado/Sierra 3500 DRW Dually 4x4 and 2wd