1985-93 Mustang ASP Underdrive Crank Pulley | 5.0/5.8 Fox Body by ASP

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1985-93 Mustang ASP Underdrive Crank Pulley | 5.0/5.8 Fox Body
1985-93 Mustang ASP Underdrive Crank Pulley | 5.0/5.8 Fox Body
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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  • 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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  • Ford Mustang - 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993
  • Engines: 5.0, 5.8

Check out our YouTube channel for even more tech tips, installation videos, how-tos, and more. The best place to go for anything Mustang related!

  • How To Remove & Install Fox Body Pulleys | 79-93 Mustang

    Check out 5.0 Resto's Fox Body pulley removal and installation steps! This applies to 1979-93 Mustangs and they are sure to make it as easy as possible! more

    Read more: fox body , 79 93 mustang , cobra

    Posted on 10/8/2020

  • California Residents:
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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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