Wilwood rear Forged Narrow Superlite 4R kit components for GM K-Series/Blazer/Jimmy 6-Lug 4x4, black calipers and 12.88-inch srp drilled and slotted rotors, with internal parking shoes
Wilwood rear Forged Narrow Superlite 4R assembly for GM K-Series/Blazer/Jimmy 6-Lug 4x4, black caliper and 12.88-inch srp drilled and slotted rotor
Wilwood rear Forged Narrow Superlite 4R kit components for GM K-Series/Blazer/Jimmy 6-Lug 4x4, black calipers and 12.88-inch srp drilled and slotted rotors, with internal parking shoes
Wilwood rear Forged Narrow Superlite 4R assembly for GM K-Series/Blazer/Jimmy 6-Lug 4x4, black caliper and 12.88-inch srp drilled and slotted rotor

Wilwood Rear Black FNSL4R Kit for GM Six-Lug 4x4 (1971–1991), 12.88-Inch SRP & Drum Parking Shoes

SKU: 140-18160-D

$2,216.93 Sale
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Fitment questions?

Call (855) 786-7101 or text (801) 304-3141. We check fitment by VIN.

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Product details

This black FNSL4R rear package uses 12.88-inch SRP drilled-and-slotted rotors for a matching GM 2.46-inch-offset axle. An internal shoe parking brake accompanies the BP-10-equipped service calipers. Bill Wood founded Wilwood Engineering in 1977; the company is based in Camarillo, California. Wilwood designs and manufactures calipers, brake rotors, master cylinders, valves, fittings and brake lines as part of its disc brake systems and component range for motorsport, street-performance and specialized applications. Each component must suit the requirements of the complete brake installation.

Technical Details

  • Manufacturer part number: 140-18160-D
  • Rotor specification: Spec-37 Iron, SRP Drilled & Slotted, vented; 12.88 x 1.10 inches
  • Caliper specification: 4-piston Forged Narrow Superlite 4R in Black Powder Coat; radial mount
  • Included service pad compound: BP-10; Stainless pistons
  • Caliper body material: Forged aluminum
  • Hydraulic inlet: 1/8-27 NPT
  • Rotor/hat wheel-stud clearance pattern(s): 6 x 5.5 in; 6 x 139.7 mm; match the installed hub/axle pattern
  • Housing/flange application: K5 Blazer / K10
  • Required axle offset: 2.46 in; 62.48 mm
  • Parking brake: included internal drum/shoe assembly; cable and clevis hardware are not included
  • Hydraulic brake hoses: not included; select the correct application-specific lines/fittings
  • Wheel clearance: 17-inch wheels may fit; verify the manufacturer’s complete caliper/rotor template for the installed wheel
  • Supplied as one kit with mounting hardware; spindles, hubs, master cylinder and booster are not included

Fitment & Compatibility

Use this 12.88-inch Superlite rear package on the specified K5 Blazer/K10 housing flange with 2.46-inch axle offset. The table identifies the matching GM six-lug 4x4 models and year splits across 1971–1991, including the related GMC and Suburban applications. Mechanical parking-brake cables must be matched to the supplied internal shoe assemblies.

Before assembly, verify a 3.55-inch axle register and the 6 x 5.5-inch wheel-stud layout. The maximum flange diameter is 7.05 inches, with the drawing’s 0.050-inch x 45-degree edge chamfer. DS1675 explains the rotor/hat alignment and parking-shoe adjustment; cable/clevis parts and hydraulic hoses are not included.

Check the complete application table below, including its model-year splits and configuration notes.

Manufacturer Resources

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 brings over 20 years of experience with brake components and fitment details. Send us your VIN together with the installed axle, spindle, brake and wheel specifications if you need help confirming this package.

Vehicle Applications

Years Make Model Model option Front brakes Rear brakes Kit application Notes
1971-1974, 1987-1991 Chevrolet Blazer 4 x 4 Disc Drum Rear Kit 1
1971-1991 GMC Jimmy 4 x 4 Disc Drum Rear Kit 1
1971-1974 GMC K15/K1500 Pickup 4 x 4 Disc Drum Rear Kit 1
1971-1974 GMC K15/K1500 Suburban 4 x 4 Disc Drum Rear Kit 1
1975-1986 Chevrolet K10 4 x 4 Disc Drum Rear Kit 1
1975-1986 Chevrolet K10 Suburban 4 x 4 Disc Drum Rear Kit 1
1975-1986 Chevrolet K5 Blazer 4 x 4 Disc Drum Rear Kit 1
1975-1978 GMC K15 4 x 4 Disc Drum Rear Kit 1
1975-1978 GMC K15 Suburban 4 x 4 Disc Drum Rear Kit 1
1979-1986 GMC K1500 4 x 4 Disc Drum Rear Kit 1
1979 GMC K1500 Suburban 4 x 4 Disc Drum Rear Kit 1
1980-1986 GMC K1500 Suburban 4 x 4 Disc Drum Rear Kit 1

Application Notes

  1. Line kit included (manufacturer): None