1985-93 Mustang ASP Underdrive Crank Pulley Black 5.0/5.8 by ASP

1985-93 Mustang ASP Underdrive Crank Pulley Black 5.0/5.8
1985-93 Mustang ASP Underdrive Crank Pulley Black 5.0/5.8
1979-95 Mustang How to Measure Serpentine Belt Length (5.0)
How To Remove & Install Pulleys On Your Fox Body Mustang (79-93)

Pick up some extra power with this ASP underdrive crank pulley for your 85-93 Fox Body Mustang 5.0/5.8L.

Item #ASP-520100
MPN# 520100

Everyday Low Price: $74.99

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  • Ford Mustang - 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993
  • Engines: 5.0, 5.8


  • Increased Power
  • Reduced Parasitic Loss of Horsepower


  • Billet Steel Construction
  • 25% Underdrive
  • Black Finish

 What's in the Box

  • (1) Underdrive Pulley
  • Mounting Hardware

1985-1993 Mustang ASP Underdrive Crank Pulley
Underdrive pulley systems increase engine horsepower by reducing the amount of power required to drive external engine accessories. For example, the alternator, power steering, water pump, and air compressor rob horsepower from the engine. By replacing factory-sized crank and accessory drive pulleys with a resized pulley, the accessories are slowed, resulting in more horsepower available to the drive wheels. Typically, a set of Auto Specialties street pulleys will increase horsepower by 12-15, and increase mileage by 2 to 3 MPG. All pulleys are manufactured from Billet Steel or Aluminum, exceeding factory quality.

  • Requires Shorter belt.*** Following are gates part numbers and are for vehicles equipped with A/C And Smog "or equivalent eliminator pulleys"
  • 4-5/8" - Pulley Diameter
  • 79-81 5.0L/5.8L K060905
  • 82-84 5.0L/5.8L K060895
  • 85-86 5.0L/5.8L K060900
  • 87-93 5.0L/5.8L K060888

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About This Brand

ASP - Quality. Performance. Products.
ASP is one of the industry's leading producers of Mustang performance pulleys. Since 1988 ASP has been machining underdrive pulleys in house to give you the most performance for your Mustang. Each pulley goes through a CNC lathe for accurate measuring and cutting. The pulleys go through 2 cycles and a quality check to ensure each part is perfect before it leaves out of the door.
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