Wilwood Single-XRD Rear Drag Brake Kit for 1958–1964 Oldsmobile/Pontiac Axle Ends, 2.81-Inch Offset and Half-Inch Studs

Rear XRD drag brakes fit the measured 1958–1964 Oldsmobile/Pontiac axle end with half-inch studs. Verify 2.81-inch offset and dynamic hat registration. The wheel-end assembly is selected by its measured housing-end interface and racing hydraulic arrangement. Wilwood Engineering was established in 1977 by Bill Wood and is based in Camarillo, California. Disc brake systems and components are its focus, from brake rotors and calipers to master cylinders, valves, brake lines and fittings. Its work spans motorsport, street-performance and specialized applications, with the complete brake system determining the correct individual components.

Technical Details

• Pad compound selection: BP-28
• Caliper piston specification: Stainless
• Hydraulic inlet thread: 1/8-27 NPT
• Brake-rotor package: 11.25 × 0.35 inches; Super Alloy; Drilled
• Wheel-diameter reference: 15 in; the complete wheel-clearance drawing determines fit
• Axle-end requirement: Olds/Pontiac; measured axle offset 2.81 in
• Retained-axle rotor mounting pattern: 5 X 4.50; 5 X 4.75; 5 X 5.00 inches; this does not change the retained hub or axle wheel pattern
• Axle stud requirement: 1/2-inch diameter
• Flexline supply: Not included; supply suitable hoses and fittings separately
• Installation hardware: Included; verify the installed fastener engagement
• Items not supplied: spindles, wheel hubs, master cylinder, brake booster
• Wilwood part number: 140-17877-D
• Conversion type: rear conversion kit; Sold as a kit.
• Caliper configuration: Forged XRD Lug Mount; 4 pistons per caliper; Type III Anodize
• Bracket-to-caliper mounting: Lug

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 1/2 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.