Wilwood GT-Slotted Rear Parking-Brake Package, Red Superlite Calipers, Big Ford New Style Housing Ends with 2.50-Inch Offset and Staggered Shocks

This rear conversion pairs red four-piston Superlite calipers with GT-slotted rotor rings and aluminum parking hats. The staggered mounting arrangement and 2.50-inch axle offset establish its application, with the drum-shoe parking system supplied independently of vehicle cables. Wilwood Engineering is based in Camarillo, California. Bill Wood founded its disc brake system and component business in 1977. The manufacturer designs and produces calipers, brake rotors, master cylinders, valves, fittings and brake lines for motorsport, street-performance and specialized uses. Each item must suit the rest of the brake system.

Technical Details

• Calipers: 4 stainless pistons per caliper; radial mounting; forged aluminium bodies. Color: Red. Finish: Red Powder Coat. Inlet thread: 1/8-27 NPT.
• Caliper family: Forged Narrow Superlite 4R. Brake-pad compound: BP-10.

• Manufacturer: Wilwood; manufacturer part number: 140-13677-R. Supplied quantity: Sold as a kit.
• Application category: Rear Brake Kits - Street Performance. Axle/spindle category: Rear Kits. Brake function: Disc; Parking.
• Separate wheel hubs included: No. Retain only the hub arrangement specified for this kit.
• Mounting hardware included: Yes. Spindles included: No. Master cylinder included: No. Brake booster included: No.
• Flexible brake lines included: No. Select the vehicle-end connection and routing separately.
• Internal parking-shoe assemblies are included. The vehicle cable/clevis connection is separate; parking cable kit 330-9371 is a separately selected option, not included.

• Wheel interface: 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. Rotor/hat wheel-stud clearance: 0.520 in; 13.21 mm.
• Nominal minimum wheel diameter: 17 in; 431.8 mm. Verify the full wheel-clearance drawing; diameter alone does not establish barrel or spoke clearance.
• Housing/spindle flange: Big Ford New Style. Flange/axle offset: 2.50 in; 63.5 mm.

• Rotor: 12.88 in; 327.15 mm outside diameter; 1.10 in; 27.94 mm thickness. Material: Spec-37 Iron. Construction: Vented. Friction-face style: GT Slotted.
• Rotor-hat material: Aluminum. Hat offset: 1.540 inches; this hat dimension is separate from axle offset.
• Rotor surface finish: Black Electro Coat.

Fitment & Compatibility

Verify the New Style housing-end measurements and the right-rear/left-front caliper positions. The Town Car entry below cannot replace an axle inspection on an original or converted car. Confirm wheel clearance and supply the correct flexlines and mechanical parking-control connections.

For staggered shock mounts, the right-hand caliper mounts behind the axle and the left-hand caliper ahead of it. Verify this orientation against the shock and suspension clearance.

Use the fitment table below for the complete model, year, submodel and brake-option conditions; every listed condition must match the installed vehicle.

Manufacturer Documents

• Wilwood product specifications and wheel-clearance drawing
• Installation instructions
• Technical bulletin

Before ordering, PMB Performance can help assess the application using your vehicle and brake-system details. Over 20 years of parts and fitment experience informs that review.