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

Market Price $119.99 You Save 17% ($20.00)
Our Price

$99.99

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  • Item 525569
  • MPN# 525569

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Features & Details

  • Free Up Horsepower
  • Complete 3 Piece Kit
  • Durable, Lightweight Aluminum
  • Black Powder Coated Finish
  • Premium Quality Construction
  • 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 lightweight aircraft grade quality aluminum 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 installs quickly and easily in under 2 hours with no modifications required.

Application. This SR Performance 3-Piece Black Aluminum 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. Reuses stock belt.

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: 1986-1993 5.0L V8  Manufacture: SR Performance
Material: Aluminum  Finish: Black Powder Coated
Crank Pulley: Piggyback SFI Certified: No
Will it fit my Mustang?
  • Foxbody - 86, 87, 88, 89, 90, 91, 92, 93
  • Cobra - 93

Fits 5.0L V8's Only

People Who Bought This Item Also Bought

Most Helpful Reviews

5/5
Pulleys

It was very easy to install and matches my engine dress

Helpful (1)

5/5
Fit and look great

Went right on no problems, great product for the money

Helpful (1)

Overall Rating 4.6 out of 5 stars
Read All 42 Reviews

Customer Photos (2) Submit Your Photo

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3 Questions / 2 Answers

Ask a Question

Has the issue with the crank bolts been resolved yet? I want to order this kit, but with the complaints about the crank bolts being the wrong size has put me off. The last thing I want to do after I get everything apart is to have to stop what I'm doing and go buy the correct ones.

RonL

  • The SR Performance Underdrive Pulleys have been corrected in all of our recent batches received from the manufacturer.

    Rob D

Helpful (0)

Can you use the stock size serpentine belt? A different review said the belt needs to be an inch bigger, is this true?

Dmass

  • The SR Performance Underdrive Pulleys are designed for use with a stock belt length.

    Rob D

Helpful (0)

What are the dimensions of the pulleys? Diameter specifically

Chris

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Customer Reviews (42) Write a Review

Overall Rating 4.6

out of 5 stars

Installation Time:Less than 1 Hour

  • Performance Gain 4.416667 4.4
  • Fit 4.805555 4.8



  • 5/5

    Installation Time: Afternoon

    January 19, 2017

    Review from SR Performance Underdrive Pulleys - Polished (86-93 5.0L)

    Pulleys

    It was very easy to install and matches my engine dress

    Jay

    Year: 1991 Submodel: Other

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    December 12, 2016

    Review from SR Performance Underdrive Pulleys - Polished (86-93 5.0L)

    Fit and look great

    Went right on no problems, great product for the money

    Tolli21

    Year: 1988 Submodel: GT

    Helpful (1)

  • 5/5

    December 12, 2016

    Review from SR Performance Underdrive Pulleys - Polished (86-93 5.0L)

    Great Product

    Easy fit and look great same problem with underdrive pulley bolts tho

    B

    Year: 1987 Submodel: Other

    Helpful (1)

  • 5/5

    August 14, 2016

    Underdrive pulleys

    Great product. Light weight yet still strong. Durable paint with a great finish. Match my steel bbk underdriver pulleys and are 25 of the weight.

    Stangman351

    Year: 1991 Submodel: Other

    Helpful (1)

  • 4/5

    July 21, 2016

    Review from SR Performance Underdrive Pulleys - Polished (86-93 5.0L)

    Looks good, but wrong bolts

    Bought these while they were on sale a few months back. The kit includes 4 bolts that appear to be crank pulley bolts, but they're far too small, and they're also too big for the water pump pulley. The heads on the bolts I already had on my stock crank pulley were too large and interfered with the wall of the underdrive pulley, due to its much smaller diameter. So because my original bolts (possibly not factory as the car has a previous owner) had heads that were too large, and the provided bolts were too small, I chose to purchase a set of ARP's. Smaller bolt heads, better clearance, better quality. BE WARNED As the description states, these pulleys are designed to work with fox's with factory pulley accessories. My car had the AC and smog pump removed many moons ago before it was mine, and so I had to shop around for a bit to find a belt that would fit. Finally got it all together and so far I'm happy. Slightly quicker throttle response, and the engine bay just looks that much prettier. I've also been told that underdrive pulleys frequently result in the engine running hot due to the fan and water pump running slower-than-stock with the pulley ratio change. I have yet to run it in any weather over 80 degrees F, but I haven't seen any cooling issues yet.

    ManBearPig

    Year: 1986 Submodel: Other

    Helpful (1)

  • 4/5

    July 20, 2016

    They look like a quality product

    I haven't installed them it ran into issues with bolts

    oxford1970

    Year: 1989 Submodel: GT

    Helpful (1)

  • 4/5

    Installation Time: Less than 1 Hour

    June 20, 2016

    Review from SR Performance Underdrive Pulleys - Polished (86-93 5.0L)

    Fantastic to a certain extent!

    Is it all in my head or does every little bit help because now i can't hardly take off with out spinning the tires. The pulleys are top quality and a beautiful finish. They do come with new allen head bolts because the crank pulley is going to be so much smaller that the original bolts will not work. You will not get a regular socket on them. They give you new bolts but you might as well just throw them a way. I've read so many reviews where other people say the same thing and you would think they would get it right after awhile but on my 1988 fox they did not. You will be going up to the hardware store to finish this project. The job is simple but could be do much more if you just got the right parts!

    Richard

    Year: 1988 Submodel: GT

    Helpful (1)

  • 4/5

    Installation Time: Less than 1 Hour

    December 14, 2015

    Review from SR Performance Underdrive Pulleys - Polished (86-93 5.0L)

    Crank bolt issue

    Having an issue, the 4 crank pulley bolts that were sent with the pulleys do not fit. The diameter is off. The original crank bolts will not work because you cannot tighten them with the smaller pulley.

    Adam

    Year: 1987 Submodel: GT

    Helpful (1)

  • 4/5

    Installation Time: Afternoon

    December 11, 2015

    Review from SR Performance Underdrive Pulleys - Polished (86-93 5.0L)

    underdrive pulley install

    Pulleys are as described, only problem is wrong size bolts for the crank pulley had to source locally, that is why the install took all afternoon

    scooter

    Year: 1989 Submodel: Other Alvin TEXAS

    Helpful (1)

  • 4/5

    Installation Time: Less than 1 Hour

    December 10, 2015

    Review from SR Performance Underdrive Pulleys - Polished (86-93 5.0L)

    Nice product nice price

    Quick install. They look great shame you have to put a belt over them. Not a huge performance upgrade...but it all adds up.

    VEGASbabyVEGAS

    Year: 1989 Submodel: Other Reno, nv

    Helpful (1)

  • 4/5

    Installation Time: Less than 1 Hour

    December 10, 2015

    Review from SR Performance Underdrive Pulleys - Polished (86-93 5.0L)

    Worth every penny spent!!!

    Quick and simple installation, got them on Black Friday , worth the wait !

    Luigi2707

    Year: 1986 Submodel: GT Atlanta ga

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    December 10, 2015

    Review from SR Performance Underdrive Pulleys - Polished (86-93 5.0L)

    Good Value

    Good bang for the buck, easy installation. Overall good product for the money.

    JDC

    Year: 1989 Submodel: Other Benson, NC

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    November 13, 2015

    Review from SR Performance Underdrive Pulleys - Polished (86-93 5.0L)

    Great throttle response

    Good looks and great throttle response with a little bump in power

    Rocket

    Year: 1988 Submodel: GT Piedmont SC

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    September 18, 2015

    Amazing power gain!

    The pulleys were super easy to install the only took roughly 20 mins!! You will feel the power gain it was really noticeable specially enough to get a speeding ticket, but on a side note your stock serp belt will not fit with the new pulleys. I went an inch and half smaller and it fit perfect!!

    Foxmonster86

    Year: 1986 Submodel: GT Post Falls, ID

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    May 29, 2015

    Review from SR Performance Underdrive Pulleys - Polished (86-93 5.0L)

    Warranty- Quality - Technical Support Managerial @ Blue Giant Equipment Corp, Loading Dock and Material Handling Equipment

    Excellent product, Overall, outstanding performance and looks. Strongly recommend it.

    UHURT

    Year: 1989 Submodel: Other Atlanta, GA

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    December 11, 2014

    more horses

    Easy to install less than an hour. Great upgrade for your mustang.

    Erikkk30

    Year: 1988 Submodel: GT San Benito, TX, USA

    Helpful (1)

  • 5/5

    July 15, 2017

    Great product

    Good quality pulleys, easy to install and new hardware

    Ironreaper

    Year: 1993 Submodel: LX

    Helpful (0)

  • 5/5

    Installation Time: Less than 1 Hour

    June 30, 2017

    Easy bolt on

    These pulleys look great and are easy to bolt on. Engine revs faster

    danield

    Year: 1979 Submodel: Other

    Helpful (0)

  • 5/5

    Installation Time: Less than 1 Hour

    June 28, 2017

    The perfect underdrives

    Clean and accurate. No wobble. A good powder coat.

    dnstommy

    Year: 1993 Submodel: LX

    Helpful (0)

  • 5/5

    June 18, 2017

    SR Underdrive pulley

    Perfect fit, great item and went right on in under a hour....

    WilliamS

    Year: 1991 Submodel: GT

    Helpful (0)

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