DuraGo BD8850 Brake Drum - Rear

DuraGo BD8850 Rear Brake Drum

The DuraGo BD8850 is a cast iron rear brake drum built for heavy-duty Chevrolet and GMC applications that use dual rear wheel configurations. It is sized for a 13-inch nominal drum diameter and a 4.02-inch brake surface width, with a full cast construction and outer cooling fins for stable braking performance.

For Chevrolet G30, C30, P30, K30, R30, V30, C3500, K3500, R3500, V3500, and GMC G35, G3500, C3500, P3500, K3500, R3500, and V3500 rear brake service, BD8850 provides the dimensional accuracy needed for proper drum-to-shoe contact. This part number is also referenced in the same application as Anchor 8025 and 8850.

Key Features

• Cast iron construction for strength and heat handling
• Full cast design with outer cooling fins
• Nominal drum diameter: 13 inches
• Brake surface width: 4.02 inches
• Outside diameter: 15.31 inches
• Center hole diameter: 4.6 inches
• Bolt circle diameter: 6.5 inches with 8 bolt holes
• Maximum brake diameter discard: 13.09 inches
• Rear position brake drum for DRW applications

Product Details

DuraGo manufactures this brake drum in ISO-certified factories with attention to fit, form, and function. The BD8850 is intended for rear axle brake service on select Chevrolet and GMC trucks and vans, including DRW-equipped models such as the Chevrolet G30 and GMC G3500. Its cast iron build and cooling-fin design support consistent drum geometry and dependable brake shoe contact under demanding use.

This part cross-references Anchor (e.g., 8025, 8850) for the same application.

What It Helps Address

• Rear brake pulsation caused by worn or out-of-round drums
• Reduced braking consistency from excessive drum wear
• Brake shoe contact issues from incorrect drum dimensions
• Heat buildup in rear drum brake service
• Service replacement needs on DRW Chevrolet and GMC rear brake systems

Installation Notes and Tips

Verify drum diameter, bolt circle, center hole, and brake surface width before installation. Confirm rear-position fitment and DRW configuration for your Chevrolet or GMC application, including models such as the Chevrolet C30, G30, P30, and GMC C3500, G3500, and P3500. Inspect brake shoes, wheel cylinders, and hardware condition during service so the new drum can seat correctly.

• Fits 1990-1991 Chevrolet G30, rear, DRW; w/ 10.5 Inch RG
• Fits 1989-1991 Chevrolet R3500, rear, Disc Brake Rotor and Hub Assembly fits DRW applications.
• Fits 1989-1991 Chevrolet V3500, rear, Disc Brake Rotor and Hub Assembly fits DRW applications.
• Fits 1990-1991 GMC G3500, rear, DRW; 7-1/4 Inch High
• Fits 1987-1991 GMC R3500, rear, Disc Brake Rotor and Hub Assembly fits DRW applications.
• Fits 1987-1991 GMC V3500, rear, Disc Brake Rotor and Hub Assembly fits DRW applications.
• Fits 1988-1989 Chevrolet C3500, rear, Disc Brake Rotor and Hub Assembly fits DRW applications.
• Fits 1981-1989 Chevrolet G30, rear, Disc Brake Rotor and Hub Assembly fits DRW applications.
• Fits 1975 Chevrolet G30, rear, Disc Brake Rotor and Hub Assembly fits DRW applications.
• Fits 1988-1989 Chevrolet K3500, rear, Disc Brake Rotor and Hub Assembly fits DRW applications.
• Fits 1980-1989 Chevrolet P30, rear, Disc Brake Rotor and Hub Assembly fits DRW applications.
• Fits 1988-1989 GMC C3500, rear, Disc Brake Rotor and Hub Assembly fits DRW applications.
• Fits 1981-1986 GMC C3500, rear, Disc Brake Rotor and Hub Assembly fits DRW applications.
• Fits 1981-1989 GMC G3500, rear, Disc Brake Rotor and Hub Assembly fits DRW applications.
• Fits 1988-1989 GMC K3500, rear, Disc Brake Rotor and Hub Assembly fits DRW applications.
• Fits 1979-1986 GMC K3500, rear, Disc Brake Rotor and Hub Assembly fits DRW applications.
• Fits 1980-1989 GMC P3500, rear, Disc Brake Rotor and Hub Assembly fits DRW applications.
• Fits 1987-1988 Chevrolet R30, rear, Disc Brake Rotor and Hub Assembly fits DRW applications.
• Fits 1987-1988 Chevrolet V30, rear, Disc Brake Rotor and Hub Assembly fits DRW applications.
• Fits 1981-1986 Chevrolet C30, rear, Disc Brake Rotor and Hub Assembly fits DRW applications.
• Fits 1977-1986 Chevrolet K30, rear, Disc Brake Rotor and Hub Assembly fits DRW applications.
• Fits 1975-1980 Chevrolet C30, rear, DRW; 3 1/2 Inch Rear Shoe
• Fits 1976-1980 Chevrolet G30, rear, DRW (JB8)
• Fits 1979-1980 GMC C3500, rear, DRW; 3 1/2 Inch Rear Shoe
• Fits 1979-1980 GMC G3500, rear, DRW (JB8)
• Fits 1976-1979 Chevrolet P30, rear, DRW; 13 x 3 1/2 Inch Rear Shoe
• Fits 1979 GMC P3500, rear, DRW; 13 x 3 1/2 Inch Rear Shoe
• Fits 1976-1978 GMC G35, rear, DRW (JB8)
• Fits 1975 Chevrolet P30, rear, DRW; 13 Inch Rear Drum
• Fits 1975 GMC G35, rear, Disc Brake Rotor and Hub Assembly fits DRW applications.
• Fits 1974 GMC G35/G3500 Van, rear, Disc Brake Rotor and Hub Assembly fits DRW applications.

Quality Assurance

DuraGo has over 45 years of aftermarket manufacturing experience, and this brake drum is produced in ISO-certified factories to meet fit, form, and function requirements. The BD8850 is built for consistent cataloged application coverage and dependable service on select Chevrolet and GMC rear brake systems.