Wilwood Rear GM 2500 (1999–2010) Parking Hat with 4.63-Inch Register

A 4.63-inch register identifies this Wilwood rear hat for 1999–2010 GM 2500 conversions. Verify 1.780-inch offset and the 8.12-inch shoe bore. 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 part number: 170-14028
• Hub-side hole clearance diameter(s): 0.640 inches; these are clearance dimensions, not wheel-stud thread sizes
• Component: Parking-Brake Rotor Hat
• Material: Iron
• Surface finish: Black E-Coat
• Rotor mounting method: Fixed Mount
• Position in the specified brake assembly: Rear
• Hat offset: 1.780 inch
• Rotor attachment interface: 12 x 10.75 inches; rotor attachment, separate from the hub flange
• Hub-flange mounting/clearance pattern(s): 8 x 6.50 inches; verify the actual hub and wheel-stud clearance
• Center register diameter: 4.63 inches
• Rotor mounting hole/thread designation: 5/16-18
• Parking-shoe bore: 8.12 inches
• Internal clearance diameter: 7.88 inches
• Mounting-face thickness: 0.32 inches

Fitment & Compatibility

For GM 2500 truck 1999–2010 brake conversions, compare the replacement with the actual hat and complete brake-kit instructions. A matching flange pattern alone does not establish rotor alignment or caliper clearance. The parking-shoe diameter, anchor arrangement and complete drum-in-hat mechanism must match. A bare hat is not a complete parking-brake assembly.

Manufacturer Reference

Wilwood component specifications and dimensions

PMB Performance has over 20 years of brake-parts experience. Send the installed component details if you need help checking this replacement.