Wilwood Rear FNSL4R Package, Black - 1958–1964 Oldsmobile / Pontiac Housing Ends, 2.81-inch Offset with 12.88-inch GT Slotted Rotors

This black FNSL4R package converts the specified Oldsmobile/Pontiac housing-end arrangement to 12.88-inch slotted rear brakes with internal parking shoes. Its 2.81-inch axle offset and 1.950-inch hat offset describe different mounting dimensions, both relevant to a correct assembly. Bill Wood established Wilwood Engineering in 1977. Based in Camarillo, California, the company designs and manufactures disc brake systems, calipers, brake rotors, master cylinders, valves, fittings and brake lines for motorsport, street-performance and specialized applications. The complete braking arrangement determines which individual components are appropriate.

Technical Details

Calipers and friction components

• Calipers: Forged Narrow Superlite 4R; 4 pistons per caliper
• Caliper finish: Black Powder Coat
• Body construction: Forged aluminum
• Piston material: stainless
• Caliper mounting: radial
• Hydraulic inlet: 1/8-27 NPT
• Included pad compound: BP-10
• Listed piston bore sizes: 1.12 / 1.12 in

Rotors and mounting dimensions

• Rotors: 12.88 in; 327.15 mm diameter x 1.10 in; 27.94 mm thick; vented Spec-37 Iron
• Friction faces: GT Slotted
• Rotor finish: Black Electro Coat
• Internal vanes: 48 curved
• Hats: aluminum; Black E-Coat; 1.950-inch hat offset
• Rotor/hat wheel-stud clearance patterns: 5 x 4.5 in; 5 x 114.3 mm; 5 x 4.75 in; 5 x 120.65 mm; 5 x 5 in; 5 x 127 mm
• Hat wheel-stud clearance holes: 0.520 / 0.520 / 0.520 in, corresponding to the listed hat patterns

Kit contents and separate parts

• Manufacturer part number: 140-9224
• Supply: one kit with brake components for both sides of the rear axle
• Mounting hardware: included
• Hubs: not included
• Spindles, master cylinder and brake booster: not included
• Hydraulic hoses: not included
• Required axle housing end: Olds/Pontiac
• Axle offset: 2.81 in; 71.37 mm
• The supplied internal-shoe parking brake operates independently of the four-piston service calipers.

Fitment & Compatibility

Selection is determined by the 1958–1964 Oldsmobile/Pontiac housing-end pattern and a measured 2.81-inch axle offset, including modified vehicles fitted with those ends. The vehicle entries in the table below do not establish stock rear-axle compatibility: a Ridetech front-spindle description does not identify the rear housing end. Verify flange, bearing, register and shock clearance using DS-534 and the axle-offset worksheet. Parking cables and hydraulic lines are purchased separately; universal cable kit 330-9371 is an application-dependent option. Nominal minimum wheel diameter: 17 in; 431.8 mm. Compare the actual wheel barrel and spokes with the linked clearance drawing; diameter alone does not establish fit.

Installation documents

• Installation instructions
• Technical bulletin

WARNING: This product can expose you to chemicals including Arsenic, Cadmium, Chromium (Hexavalent compounds), Lead, Nickel, Cobalt and Antimony Trioxide which are known to the State of California to cause cancer or other reproductive harm. For more information go to www.p65warnings.ca.gov.

PMB Performance has supported brake and restoration projects for more than 20 years. Share the vehicle and installed hardware with us for help selecting a compatible package.

Vehicle Applications

Application Notes

1. Universal Flexline kits available: 220-7056 (14"), 220-7699 (16") or 220-8307 (18"). Choose correct length for your application.
2. Universal Parking Brake cable kit, may require modifications to cable or vehicle to install.
3. Line kit included (manufacturer): None