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

AmericanMuscle no longer carries the SR Performance Underdrive Pulleys - Black Steel (86-93 5.0L). Please check out 1979-1993 Foxbody Mustang Underdrive Pulleys for an updated selection.
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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

MPN# 94331

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

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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Questions & Answers (7)

5 Top Rated Questions

i have a 92 gt and i have the a/c deleted can i still use these pulleys?

  • The SR Performance Underdrive Pulleys will be able to be used with an A/C delete that uses an A/C delete idler pulley. If the A/C was delete was performed via a shorter belt rerouted to eliminate the A/C pulley completely, then these pulleys will cause belt interference and will not work.

Helpful (1)

These are listed to not fit 79 to 85 Mustangs. As some of the other pulley kits are listed to fit 79 to 93, what about these are different so they do not fit the earlier cars that have factory serpentine systems such as on the 84 and 85 V-8 cars?

  • This underdrive pulley kit will fit 86-93 Mustang 5.0Ls. 

Helpful (0)

Will is balancer work for my 1986 Ford Mustang 3.8 v6

  • Sorry, this is for 5.0 V8's only.

Helpful (0)

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.

Helpful (0)
Post Your Question
2 More Questions
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? 1 answer
can i use my old belt I don't have ac or smog pump 1 answer

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Customer Reviews (26) Write a Review

Overall Rating 4.3

out of 5 stars

Installation Time:Less than 1 Hour

  • Performance Gain 4.333333 4.3
  • Fit 4.25 4.3



  • 4/5

    Installation Time: Less than 1 Hour

    October 23, 2018

    Great product

    Used on my engine swapped 84 f150 worked great and runs even better

    SethK

    Year: 1989 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    August 10, 2018

    Very nice

    These are very light weight, nice coating on them, I did have to lightly enlarge the center hole for water pump but not very much at all. I thought I ordered steel but these seem to be aluminum. I’ve only ran them a week so far, my last set of different brand lasted many years till wp pulley wore a groove in it, bought these to replace them.

    StephenM

    Year: 1988 Submodel: LX

    Helpful (2)

  • 5/5

    Installation Time: Less than 1 Hour

    July 30, 2018

    Good quality and perfect fitment

    Good quality product. Fit perfectly on my pro products balancer. Don't forget the spacer like I did the first time if one is needed.

    RyanH

    Year: 1991 Submodel: LX

    Helpful (3)

  • 5/5

    Installation Time: Afternoon

    June 28, 2018

    Easy install.

    Took It in to my mechanic for install and he had no problem popping them on.

    93L3609

    Year: 1993 Submodel: GT

    Helpful (3)

  • 5/5

    Installation Time: Less than 1 Hour

    April 24, 2018

    3pcs pulley set

    Inexpensive set of pulleys, quality is good. Would recommend to a friend.

    JerryR

    Helpful (3)

  • 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.

    DavidG

    Year: 1990 Submodel: LX

    Helpful (4)

  • 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.

    donaldm

    Year: 1986 Submodel: Other

    Helpful (6)

  • 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.

    94gtvert

    Year: 1994 Submodel: GT

    Helpful (3)

  • 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

    DaltonW

    Year: 1988 Submodel: GT

    Helpful (4)

  • 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.

    MiguelA

    Year: 1988 Submodel: GT

    Helpful (5)

  • 4/5

    Installation Time: Afternoon

    December 23, 2016

    Good solid gears

    Product seems very well made will leave more feedback after installed

    Adod

    Year: 1989 Submodel: LX

    Helpful (5)

  • 5/5

    September 07, 2016

    Pulleys

    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.

    Chech

    Year: 1993 Submodel: GT

    Helpful (3)

  • 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

    Mikestang559

    Year: 1992 Submodel: GT

    Helpful (5)

  • 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.

    Luker

    Year: 1988 Submodel: GT NY

    Helpful (5)

  • 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

    Bill

    Year: 1988 Submodel: Other Erie, Pa.

    Helpful (5)

  • 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.

    Trmn8tr

    Year: 2003 Submodel: Cobra Colorado, USA

    Helpful (5)

  • 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.

    Njjack2

    Year: 1990 Submodel: Other Tallahassee, FL, USA

    Helpful (5)

  • 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.

    Dylan19

    Year: 1991 Submodel: Other Atkins, AR

    Helpful (6)

  • 4/5

    Installation Time: Afternoon

    March 22, 2013

    this product is ok

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

    biran11

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

    Helpful (4)

  • 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.

    Brett17

    Year: 1988 Submodel: Other Florida

    Helpful (7)

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