Rust Buster Over-Axle Frame Repair Kit (Left / Driver Side) - RB7321L

The Rust Buster RB7321L Over-Axle Frame Repair Kit is a driver-side frame rail section engineered for 1999–2006 Chevrolet Silverado 1500 and GMC Sierra 1500 trucks. Made from heavy-duty 7-gauge steel, this 22.25-inch repair piece caps the frame between the fuel tank crossmember and rear shock crossmember—an area commonly weakened by corrosion. Ships with an oil coating to prevent oxidation prior to installation. Welding is required.

Product Features

• Fits 1999–2006 Chevrolet Silverado 1500

• Fits 1999–2006 GMC Sierra 1500

• Fits all cab & bed configurations

• Driver-side (left) over-axle frame repair section

  • For passenger side, see RB7321R

• Caps the frame rail between the fuel tank crossmember and rear shock crossmember

• Measures 22.25" in length

• Constructed from heavy-duty 7-gauge steel

• Ships with protective oil coating to prevent oxidation during transit

• Welding required

• Recommended to protect with Rust Buster Rust Converter Paint RB9917

• Lifetime Warranty

Product Details

• Brand: Rust Buster

• Part Number: RB7321L

• Product Type: Over-Axle Frame Repair Section (Driver/Left Side)

• Material: 7-gauge steel

• Length: 22.25"

• Installation: Welding required

• Coating: Oil-based protective coating

Fitment

• 1999–2006 Chevrolet Silverado 1500

• 1999–2006 GMC Sierra 1500

• Fits all cab and bed configurations

Additional Information

The 1999–2006 GM 1500 trucks—known for their capability and V8 power—often suffer frame corrosion due to road salt and moisture exposure. Rust Buster engineered the RB7321L to restore structural integrity in a high-stress area of the frame. Using advanced scanning and CAD modeling, each section is built for OE-like fitment and long-term durability. Backed by Rust Buster’s Lifetime Warranty, this kit ensures your truck stays on the road where it belongs.