Sierra 1500 2025-2026 GMC 4WD/2WD 5" Rear Block Kit (4" actual lift) by ReadyLift

The ReadyLIFT 26-35500 5" Rear Block Kit for the GMC Sierra 1500 delivers a heavy-duty, OEM-style solution for safely increasing rear ride height and improving load-carrying performance. Designed specifically for the new body-style 6-lug GM trucks, this kit replaces the factory 1" block to provide a full 4" of net rear lift—ideal for trucks equipped with a front leveling kit or those used frequently for towing and hauling.

This complete kit includes two 5" cast iron rear blocks with integrated anti-rotation ears, four E-coated U-bolts, and all required nuts and washers. Built from cast iron rather than lightweight extrusions, these blocks follow OEM design standards to ensure maximum strength, proper fitment, and long-term durability. The system also eliminates the unsafe practice of stacking blocks, which is restricted or illegal in many states.

By restoring a functional rear rake, the ReadyLIFT 5" Rear Block Kit enhances stability under load and works seamlessly with ReadyLIFT leveling systems. Backed by ReadyLIFT’s Lifetime Warranty, this kit delivers reliable performance for heavy-duty use and everyday driving.

Features and Benefits:

• Fits GMC Sierra 1500 new body style (6-lug models)
• Replaces the factory 1" block for a net 4" rear lift
• Includes two 5" cast iron rear blocks with integrated anti-rotation ears
• Comes with four E-coated U-bolts plus nuts and washers
• OEM-style design ensures strength, durability, and proper fitment
• Eliminates unsafe block stacking, which is restricted in many states
• Restores a functional rear rake for improved towing and hauling stability
• Ideal for trucks equipped with a front leveling kit
• Enhances rear load support and overall vehicle stance
• Backed by ReadyLIFT’s Lifetime Warranty