2020-2026 Duramax Gen-Y DEFIANCE Headache Rack (GH-27007)

The Gen-Y DEFIANCE headache rack gives your GMC Sierra 2500HD and Sierra 3500HD rugged cab protection without the weight penalty of steel. All-aluminum construction keeps it light and corrosion resistant, and the modular design lets you run it as a bare base rack or add MOLLE or louver panels for more coverage and gear mounting.

Every configuration ships with the mounting hardware required, and no drilling is needed on most models.

Part Number: GH-27007 (Base Rack Only), GH-28007 (Base Rack + 3 MOLLE Panels), GH-29007 (Base Rack + 3 Louver Panels)

• All-aluminum construction for durable, corrosion resistant cab protection
• Modular design: run the base rack alone, or add MOLLE or louver panels
• MOLLE panels accept a wide range of accessory mounts and gear
• Louver panels shield the cab while keeping rearward visibility
• Direct fit for 2020-2026 GMC Sierra 2500HD and Sierra 3500HD
• All mounting hardware included, no drilling required on most models

• A complete panel set is 3 panels: 2 outer panels and 1 center panel
• Individual panels are sold separately as upgrades or replacements, see DEFIANCE Headache Rack Replacement Panels
• Panels fit the DEFIANCE base rack only and are not interchangeable between vehicle applications
• This rack was previously marketed as the DEFENDER headache rack. Gen-Y renamed it to DEFIANCE following a trademark review. Same build, same fitment, same part numbers