Wilwood Rear Single-XRD Drag Brake Kit, Oldsmobile/Pontiac 2.81-Inch Axle Offset, 11/16-Inch Studs and Drilled Dynamic Rotors

Single XRD rear calipers and drilled Super Alloy rotors suit measured Oldsmobile/Pontiac axle ends. Match the 11/16-inch studs and 2.81-inch offset. The wheel-end assembly is selected by its measured housing-end interface and racing hydraulic arrangement. Camarillo, California, is home to Wilwood Engineering, the disc-brake manufacturer Bill Wood founded in 1977. Wilwood designs and manufactures systems and components including master cylinders, calipers, rotors, valves, fittings and brake lines. Those parts serve motorsport, street-performance and specialized uses and must be selected as part of the complete brake system.

Technical Details

• Mount arrangement: Lug
• Supplied brake-pad material: BP-28
• Caliper piston construction: Stainless
• Caliper fluid connection: 1/8-27 NPT
• Rotor diameter, width, material and face: 11.25 × 0.35 inches; Super Alloy; Drilled
• Nominal wheel diameter starting point: 15 in; the complete wheel-clearance drawing determines fit
• Housing-end flange and axle relationship: Olds/Pontiac; measured axle offset 2.81 in
• Hat drilling for retained axle flange: 5 x 5.00; 5 x 4.75 inches; this does not change the retained hub or axle wheel pattern
• Axle stud requirement: 11/16-inch diameter, as specified in the exact installation instructions
• Brake-hose provision: Not included; supply suitable hoses and fittings separately
• Supplied installation fasteners: Included; verify the installed fastener engagement
• Components outside the kit: spindles, wheel hubs, master cylinder, brake booster
• Wilwood manufacturer number: 140-17879-D
• Kit function and position: rear conversion kit; Sold as a kit.
• Caliper family, piston count and finish: Forged XRD Lug Mount; 4 pistons per caliper; Type III Anodize

Fitment & Compatibility

Select this rear drag-racing kit by the 1958–1964 Oldsmobile/Pontiac flange and measured 2.81-inch axle offset. The required axle stud diameter is 11/16 inch. One four-piston XRD caliper mounts at each rear rotor; match the bearing retainers and bracket bolt centers. The dynamic lug-drive hats retain the drilled Super Alloy rotors with internal snap rings, allowing the rotor and hat to expand separately. Hat drillings do not alter the axle wheel pattern. Provide hydraulic flexlines separately and use the exact wheel-clearance drawing. Vehicle names in the table below (Chevelle, 442, Beaumont, Camaro, Apollo) do not establish the installed rear housing; confirm the axle measurements individually.

Wilwood product specifications · Wilwood installation and compatibility information · Axle measurement worksheet · Wilwood installation and compatibility information

Before purchase, send PMB Performance the actual housing flange, axle offset, rotor registration and parking or hydraulic arrangement. Our over 20 years of parts and fitment experience helps identify the installation details that need to be checked.

Manufacturer warning — brake pads only: WARNING: Cancer and Reproductive Harm. www.P65Warnings.ca.gov.