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SR Performance Underdrive Pulleys - Black Steel (86-93 5.0L)

Market Price $79.99 You Save 25% ($20.04)
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  • Item 94331
  • MPN# 94331

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    Features & Details

    • Free Up Horsepower
    • Complete 3 Piece Kit
    • Durable Steel Construction
    • Black Finish
    • Premium Quality
    • Fits 1986-1993 5.0L V8 Mustangs
    Free Up Horsepower. A set of SR Performance Underdrive Pulleys reduce parasitic drivetrain loss by cutting down the amount of power your accessories take up, these underdrive pulleys will free up 10+ horsepower, without sacrificing cooling and charging functionality of your Pony.

    Premium Quality Construction. CNC-machined from aircraft grade quality steel alloy for strength and durability, these SR Performance pulleys feature a gloss black powder coated finish for aggressive good looks and long lasting corrosion resistance.

    Easy Installation. These SR Performance Mustang Underdrive Pulleys install quickly and easily in under 2 hours with no modifications required.

    Application. This SR Performance 3-Piece Steel Underdrive Pulley Kit is designed for use on 1986 to 1993 Ford Mustangs equipped with the  iconic push rod 5.0L V8 engine, including the LX 5.0, GT and SVT Cobra models.

    Fitment: 1986 1987 1988 1989 1990 1991 1992 1993 Details

    What's in the Box
    • (1) water pump pulley
    • (1) alternator pulley
    • (1) crank pulley
    • (4) bolts
    Installation Info
    Tech Specs
    UnderDrive Pulley Specifications
    Year/Model: 1979-1993 5.0L V8    
    Material: Steel Finish: Black
    Crank Pulley: Piggyback SFI Certifited: No
    Will it fit my Mustang?

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    4 Questions / 4 Answers

    Ask a Question

    Will these pulley's work on a 5.0 EFI, 89 crown vic ? I'm only running the alternator, power steering pump, water pump and crank.


    • This SR Performance 3-Piece Steel Underdrive Pulley Kit is designed for use on 1986 to 1993 Ford Mustangs, We would not be able to guarantee fitment on a crown vic.


    Helpful (0)

    What size belt do I need for this set?


    • The SR Performance Underdrive Pulleys use a stock Length belt.

      Rob D

    Helpful (0)

    I have a electric water pump and no power steering so can I run just the belt from the alternator pulley to the crank pulley. will these pulleys work for my application?


    • Just bought my first mustang. Looking for a up grade from the stock Cam.


    Helpful (0)

    can i use my old belt I don't have ac or smog pump


    • You can run a 4 cyclinder a/c belt but instead of running it under the idler pully run the belt over the pully. In other words instead of the idler pully pushing down on the belt run the belt over the pully. You will have to loosen up the idler to get it to run over it and then tighten the idler back. I ran mine this way for years and it worked great.


    Helpful (0)

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    Customer Reviews (21) Write a Review

    Overall Rating 4.2

    out of 5 stars

    Installation Time:Less than 1 Hour

    • Performance Gain 4.263158 4.3
    • Fit 4.105263 4.1

    • 1/5

      Installation Time: Less than 1 Hour

      February 02, 2018

      Just 'ok'

      Like another reviewer mentioned, they're clearly not well made relative to clearances. I had to remove the powder coating on all three pulley's in order for them to fit. I had to enlarge the bolt holes on the crank pulley as they were not very well lined up. The alternator pulley would not fit without removing the powder coating in the center of the pulley, and the water pump pulley had to have the coating removed from all five holes I would recommend you spend a bit more and get the BBK pulleys.


      Year: 1990 Submodel: LX

      Helpful (1)

    • 2/5

      Installation Time: Less than 1 Hour

      January 10, 2018

      don't fit well

      Be careful when installing the waterpump pulley as the i had to file out the center hole to fit over the waterpump spindle. When test fitting it got stuck and when it popped off it dented and almost took put my new aluminum radiator. Make sure to cover or stand a piece of plywood up in front of your radiator when test fitting in case it is too tight on the waterpump shaft. Again I had to file the inside out to make it fit on mine.


      Year: 1986 Submodel: Other

      Helpful (2)

    • 3/5

      October 14, 2017

      SRP underdrive pilleys

      first off, they look nice. but the powder coating is very thin and if they are in fact steel they seem more like aluminum and I had to take the dremmel to the crank pulley and open it up to fit the crank. I didn't use the alternator pulley we will see if they hold up.


      Year: 1994 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      October 04, 2017

      Highly impressed

      Perfect fit, sleek look, all of them together don't weigh as much as your crank pulley/ harmonic balance. Car revs faster and they free up quite a bit of horsepower


      Year: 1988 Submodel: GT

      Helpful (0)

    • 1/5

      Installation Time: Less than 1 Hour

      September 23, 2017

      Not perfect fit!

      The alternator pulley hole was too small it wouldn't fit at all. Mine came in pretty scratched up like if they send me some that someone else had returned to AM.


      Year: 1988 Submodel: GT

      Helpful (2)

    • 4/5

      Installation Time: Afternoon

      December 23, 2016

      Good solid gears

      Product seems very well made will leave more feedback after installed


      Year: 1989 Submodel: LX

      Helpful (2)

    • 5/5

      September 07, 2016


      Easy install quickest and cheapest horse power! Don't know what else to say to use up 50 words but I guess this will have to do.


      Year: 1993 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      April 27, 2016

      Extra horsepower for cheap

      Nice looking pulleys easy to install less than a hour to install notice difference in throttle response and power thanks American muscle


      Year: 1992 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Afternoon

      October 21, 2015

      Great 'seat of the pants' upgrade

      Its an upgrade you can feel. I had to replace my harmonic balancer anyways as the rubber was deteriorating. So it made sense to upgrade the pulleys and replace the crank seal. Not a bad price either.


      Year: 1988 Submodel: GT NY

      Helpful (3)

    • 5/5

      Installation Time: Afternoon

      September 18, 2015

      1988 Mustang Lx 5.0 Father Son project.

      Great fit and a pretty easy install. Cleaned up the engine and gain a few more horsepower. Well worth the money. Bill / Zack


      Year: 1988 Submodel: Other Erie, Pa.

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      October 15, 2014

      Great inexensive upgrade

      Bought this for my son's LX, bolted right up and looks great! Alternator pulley was most challenging to get off without any power tools but was definitely worth it.


      Year: 2003 Submodel: Cobra Colorado, USA

      Helpful (3)

    • 5/5

      Installation Time: Less than 1 Hour

      April 28, 2014

      Works great!

      Installed and works great! I'm glad you had an affordable option.


      Year: 1990 Submodel: Other Tallahassee, FL, USA

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      March 24, 2013

      Sr performance under drive pulleys

      Put this on a 91 lx along with a cold air intake and could tell a big difference immediately. I would defiantly recommend the under drive pulleys.


      Year: 1991 Submodel: Other Atkins, AR

      Helpful (3)

    • 4/5

      Installation Time: Afternoon

      March 22, 2013

      this product is ok

      Really didn't feel any difference, and the actual parts felt fragile.


      Year: 1990 Submodel: GT 10233 State Street, Lynwood, CA 90262, USA

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      February 25, 2013

      Well Worth the Money

      Easy Install. Could feel the performance gain instantly. RPMs climb faster. Cheap price. Great deal. Definitely worth the money.


      Year: 1988 Submodel: Other Florida

      Helpful (4)

    • 5/5

      Installation Time: Less than 1 Hour

      January 18, 2013

      1993 mustang

      I installed these user drive pullies in about twenty minutes and when I drove the car I could immediately feel the difference the Rpms shot up with easy and it definitely felt like the car pulled hard I would definitely recommend these pullies


      Year: 1993 Submodel: Other San Antonio, TX, USA

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      September 21, 2012

      show me the money!

      Well worth the money for the performance u get . Can churp the tires in third and don't realy have to try!


      Year: 1991 Submodel: GT Kewaunee, WI, USA

      Helpful (1)

    • 4/5

      Installation Time: Less than 1 Hour

      June 30, 2012

      Easy power

      Improved power snap, you can feel the small power gain. Finish on the parts was ok but definetly not a show part. Unexpectedly improved my idle! Worth the money and time without a doubt.


      Year: 1989 Submodel: Other Redmond, OR

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      May 28, 2012

      1990 5.0

      Rpm climb faster than normal easy fit and job but really quick to get done took about 30 min for old off and new on


      Year: 1990 Submodel: GT Branson, MO, USA

      Helpful (0)

    • 4/5

      Installation Time: Less than 1 Hour

      August 29, 2011

      Does what they say they will, but not the best

      bought these for the old 5.0, and they work perfectly, however there were a few minor annoyances with them that did not effect performance. the paint (or powdercoat?) is too thick and needed to be sanded on the water pump pulley to fit onto the pump, and there are a few areas that the paint is too thin, showing some bare metal (most are hidden after the install) i striped them and redid them flat black so neither cause any issues when i was done. if you are looking for show pieces, these arent for you, but if you want the performance on the cheap, and the looks arent a big deal, these are for you


      Year: 1986 Submodel: Other Downingtown, PA

      Helpful (1)

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