Dorman 999-888 Frame Crossmember - Rear

Dorman 999-888 Frame Crossmember

This Dorman frame crossmember is a direct-fit replacement for a damaged rear spare tire crossmember on select Chevrolet Silverado and GMC Sierra trucks. Built from steel and formed to factory dimensions, it supports a precise frame repair for rust or impact damage.

Key Features

• Steel construction for durable frame repair
• Specific fit replacement for select GM heavy-duty trucks
• Matches factory dimensions for accurate alignment
• One-piece configuration for a clean replacement install
• Includes mounting hardware
• Part number 999-888 for ordering and reference

Detailed Description

Dorman 999-888 is a standard replacement frame crossmember engineered for the rear spare tire crossmember location. It is made of steel with a 3 mm material thickness and measures 41.5 inches long by 19.5 inches wide. With 16 mounting holes and a 12 mm mounting hole diameter, this crossmember is built to match the original frame geometry for a true repair on Chevrolet Silverado 2500 HD, Silverado 3500 HD, Silverado 2500, Silverado 3500, Silverado 2500 HD Classic, Silverado 3500 Classic, Avalanche 2500, GMC Sierra 2500 HD, Sierra 3500 HD, Sierra 2500, Sierra 3500, Sierra 2500 HD Classic, and Sierra 3500 Classic applications. Part number 999-888 also cross-references OE numbers 12479977 and 15200476 for the same application.

What It Helps Repair

• Corrosion damage in the rear frame crossmember area
• Impact damage to the spare tire crossmember
• Frame alignment issues caused by a weakened crossmember
• Rust-related structural deterioration on GM truck frames
• Replacement needs after failed original equipment crossmember sections

Installation Notes and Tips

Fits 2001-2006 Chevrolet Silverado 2500, rear; 2005-2006 Chevrolet Silverado 3500, rear; 2002-2006 Chevrolet Avalanche 2500, rear; 2007 Chevrolet Silverado 2500 HD Classic, rear; 2007 Chevrolet Silverado 3500 Classic, rear; 2008-2010 Chevrolet Silverado 2500 HD, rear; 2008-2010 Chevrolet Silverado 3500 HD, rear; 2001-2006 GMC Sierra 2500, rear; 2001-2006 GMC Sierra 2500 HD, rear; 2005-2006 GMC Sierra 3500, rear; 2007 GMC Sierra 2500 HD Classic, rear; 2007 GMC Sierra 3500 Classic, rear; 2008-2010 GMC Sierra 2500 HD, rear; 2008-2010 GMC Sierra 3500 HD, rear. Verify frame condition and mounting points before installation, and confirm hole alignment against the original crossmember location prior to final tightening.

Quality Assurance

Dorman supplies this frame crossmember as a standard replacement part built to restore factory-style fit and function. The steel construction and OE-matched dimensions support a consistent repair on compatible Chevrolet Silverado and GMC Sierra trucks.