Wilwood Rear Staggered-Shock GM 12-Bolt Kit, Black Dynalite/MC4 Calipers and 12.19-Inch Plain Rotors — Selected 1964–1974 Applications

This staggered-shock rear kit is designed around the modified GM 12-bolt C-clip-eliminator axle. Black Dynalite service calipers and MC4 parking units use plain-face 12.19-inch rotors at the specified 2.91-inch axle offset. Wilwood Engineering is a Camarillo, California manufacturer founded by Bill Wood in 1977. Disc brake design and manufacturing extend across calipers, brake rotors, master cylinders, valves, fittings and brake lines. Parts for street-performance, specialized applications and motorsport must be selected to meet the requirements of the complete brake system.

Technical Details

• Manufacturer: Wilwood
• Manufacturer part number: 140-14259
• Kit classification: Rear Brake Kits - Street Performance
• Axle position: Rear Kits
• Brake Type: Disc; Parking
• Selling unit: Sold as a kit.
• Rotor Outside Diameter: 12.19 in; 309.63 mm
• Rotor Thickness: 0.81 in; 20.57 mm
• Rotor Material: Iron
• Surface Type: Plain Face
• Rotor construction: Vented
• Bolt Circle Diameter: 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
• Catalog stud / mounting-hole reference: 0.520 in; 13.21 mm
• Rotor surface finish: Plain
• Hat material: Aluminum
• Hat finish: Black E-Coat
• Hat offset dimension: 2.000 in
• Minimum wheel guidance (clearance drawing required): 15 in; 381 mm
• Required rear axle / flange: 12 Bolt C-Clip Eliminator
• Catalog axle-offset reference: 2.91 in; 73.91 mm
• Spindle Included: No
• Mounting Hardware Included: Yes
• Separate wheel hubs included: No
• Master Cylinder Included: No
• Brake Booster Included: No
• Brake Lines Included: No
• Pistons per service caliper: 4
• Service-caliper piston construction: Stainless
• Service-caliper mount: Lug
• Caliper body construction: Forged aluminum
• Caliper Color: Black
• Caliper Finish: Black Powder Coat
• Caliper Inlet Port Diameter: 1/8-27 NPT
• Caliper family: Dynalite
• Pad compound: BP-10

Fitment & Compatibility

DS-1185 specifies the staggered-shock GM 12-bolt C-clip-eliminator rear arrangement, not a front-spindle conversion. Match the modified housing ends, customer-supplied eliminator bearings, 2.91-inch axle offset and 3.06-inch center registration. Vehicle rows referencing Ridetech spindles do not confirm that rear geometry. Hoses, parking cables and their adapters are separate, and the 15-inch wheel guidance requires a template check.

Listed models: Chevelle; 442; Beaumont; Camaro; Apollo. Use the fitment table below for the individual years, submodels and equipment conditions.

Wilwood product specifications · Installation instructions · Technical bulletin

Our team at PMB Performance has over 20 years of parts and fitment experience. The existing component number and brake-system details help us check the match.