2011-2025 Duramax 1.0" Rear Block Kit (HP10503)

Fits

Pacbrake’s 1.0" Rear Block Kit is built for heavy haulers and tow rigs that see real work. This kit gives your truck better weight distribution and improved control under load, all while holding up to whatever abuse you throw at it. No plastic parts here, just cast iron muscle and high-strength hardware you can trust.

Part Number: HP10503

• Solid cast iron blocks for long-term durability
  
• Grade 10.9 high-strength U-bolts
  
• Geomet coating resists rust and road grime
  
• Zinc-plated flange nuts to fight corrosion
  
• No cutting or mods required
  
• Fits up to 35" tires

Click here for instructions.

• Will not fit Cab & Chassis or dual rear wheel (DRW) models
  
• Not compatible with trucks without AUX/Overload springs