2011-2025 Duramax HD 1" Rear Block Kit (26-30100)

Fits

Year	Make	Model	Configuration
2011-2025	Chevy / GMC	2500 / 3500 HD	2WD / 4WD (8-Lug SRW)

ReadyLIFT OEM-style rear block kits are the perfect solution for 2011-2025 GM 2500/3500 HD single rear wheel (SRW) pickups looking for a reliable 1" lift. These kits are specifically designed to put a slight rake back into your truck for better hauling and towing performance, making them an ideal companion for a front leveling kit. Unlike lightweight extrusions, these blocks are made from cast iron—just like factory components—to ensure maximum strength and reliability.

Part Number: 26-30100

Supersedes Part Number: 66-3111

Features

• Cast iron construction provides superior strength compared to aftermarket aluminum or light-duty blocks.
• Includes two 1" rear blocks and four E-coated U-bolts with all necessary nuts and washers.
• Designed to safely lift 8-lug GM trucks equipped with the trailer package spring by 1".
• Works seamlessly with ReadyLIFT suspension leveling kits.

Kit Components

• (2) 1" Cast Iron Rear Blocks
• (4) E-Coated U-Bolts
• (8) Nuts and Washers

Notes

• Configuration: Fits Single Rear Wheel (SRW) trucks only; not compatible with Dually (DRW) models.
• Installation: Estimated installation time is approximately 1.5 hours. Professional installation by a certified mechanic is recommended.
• Post-Install: A professional alignment, headlamp adjustment, and ADAS recalibration (if equipped) are necessary following installation.
• Safety: Modifying your suspension changes vehicle handling. Always drive with caution and follow all safety warnings regarding modified vehicle dynamics.