Guaranteed Free Delivery by 12/24! available on most items - Details

Talk to a Mustang Enthusiast
1-877-887-1105
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Win $5,000 For Your Mustang! Enter Daily
In Time For Christmas These & Many More

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

Item 525569
$0.00
Market Price $108.99 You Save 13% ($14.00)
Our Price

$94.99

FREE Shipping

Will this fit your Vehicle?

Select a different vehicle Help?
Update or Change Vehicle
In Stock

Ship to: Ashburn - 20149
Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
    Create a list
    Add to New List

    Saved - View your saved items

    We're sorry. We couldn't save this product at this time.

    Features, Video & 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

    Review & Installation Video

    Review & Install Video

    These are the SR Performance underdrive pulleys for '86 to '93 5-liter Mustangs. You're gonna wanna check out the SR Performance underdrive pulleys if you're looking for a set of pulleys to free up a touch of horsepower in a fast, easy, and very affordable way. The SR Performance pulleys cost the least out of any pulley option, so they're currently the most budget-friendly. Now the theory behind underdrive pulleys is that factory pulleys require a lot of energy. A set of lightweight aluminum pulleys like these here, reduce the amount of parasitic drivetrain loss by cutting down on the amount of power it takes to run the accessories, like your water pump, your alternator, and the AC compressor, and some people mentioned noticing a difference after installing these. Underdrive pulleys are only a good idea if you plan on keeping your car naturally aspirated, so just keep that in mind when you figure out your future plans. The install for these is gonna be an easy one out of three wrenches in the difficulty meter, and you can plan on spending about two hours to get the install done. So the engine uses its own power to rotate the serpentine belt starting at the crankshaft. This pulley then uses the engine's power to rotate the rest of the pulleys. So when you reduce the size of the crankshaft pulley, it's gonna require less energy to rotate the accessories. The pulleys in this set are lightweight aluminum, which means that they'll require even less energy to rotate. This set has a powder-coated black finish, but SR Performance also sells a set that's polished if you like the look of those instead. This kit's gonna include the crank pulley, the water pump pulley, and the alternator pulley, as well as the hardware to get these installed. The nice thing about these is that you'll be able to free up the power that the engine's currently using to rotate these pulleys, but you won't sacrifice the effectiveness of the accessories. So your water pump and your alternator will still function perfectly, they'll just require less power from the engine to operate. The only time that you can see issues is if you have an aftermarket sound system and an upgraded alternator. These items are more taxing on the car system and will require more work from the alternator. So if that's the case, I would recommend steering away from underdrive pulleys. But for those of you that don't have that kinda setup, these will reuse the stock belt so you won't have to get a different size belt which will make it easier when you need to replace your belt. When it comes to fitment, just make sure you're shopping for the correct thing here. These are underdrive pulleys for the '86 to '93 5-liter. And this kit is made to reuse the stock belt and assumes that everything is still stock. If you've eliminated anything, like your smog pump or your AC, you will have to do some of your own engineering here as far as the belt sizes go. But if you're still stuck and haven't deleted your smog pump or your air conditioning, you'll reuse the stock size belt. As far as price, you're looking at right about $100 for this kit. This is one of the most affordable pulley kits currently at this time. If you wanted to spend less, SR Performance also sells a black steel set that's gonna weigh a little bit more, but it will cost less. Don't forget you do have the choice of the SR Performance polish pulley kit if you didn't want the black set, or you have the choice of another brand like BBK or Steeda. Just know that they won't be as price-friendly as this kit is. The install here is easy, and I'm gonna call it a one outta three wrenches in the difficulty meter. You're gonna expect to spend about two hours getting the install done, and you'll just need some basic hand tools to get the job done, which includes a socket set. You should loosen the knot in the center of the alternator prior to removing the belt and loosen the water pump bolts and the crank pulley bolts as well. You'll need to release the tension on your serpentine belt and set it aside. From there, it's just a matter of unbolting the factory pulleys and replacing them with the underdrive pulleys from the SR Performance kit. Once they're bolted in, release the tension pulley again and put the serpentine belt back on. You'll need to make sure that it's on properly by following the diagram that's usually located on the radiator cover. Wrapping things up here with the SR Performance underdrive pulleys, these pulleys are for the '86 to '93 5-liter Mustang. And you can check them out more online right here at americanmuscle.com.

    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.

    SR Performance

    Fitment: 1986 1987 1988 1989 1990 1991 1992 1993 Details

    MPN# 525569

    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: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?

      Customer Photos (4) Submit Your Photo

      View All 4 Photos

        Questions & Answers (9)

        5 Top Rated Questions

        Will this work on my 351W

        • The SR Performance Underdrive Pulleys are designed for the 5.0L 302 blocks. They are not designed to work with the 5.8L 351W.

        Helpful (1)

        Hi so the pulleys will get you 10/15 more horse only if you do other mods?? Is this correct I want to get me a set . My mods are shorty headers h- pipe a set of flow masters right now I want to put on the pulleys and a different mass air unit. I have a speed density system I am going to keep the SD system. Then possibly different upper and lower intake. Is it worth it to to buy and install the pulleys with these few mods? Will I get the 10/15 horse? Even if I don't go with the upper and lower intakes? Thanks much Mike

        With the SR pulleys will the car full charge at idle?

        • These SR Performance Underdrive Pulleys will free up 10+ horsepower, without sacrificing cooling and charging functionality of your Pony.

        Helpful (0)

        you usually need a different belt with under drive pulleys, what is difference with the SR pulleys since it reuses the stock belt? Thanks -Will

        • The SR Performance Underdrive Pulleys are sized to be able to reuse the OEM belt. This is true of both the BBK and SR underdrive pulleys we offer.

        Helpful (0)

        will these pullies work with a car thea has an a/c delete?

        • Yes, these Pulleys would work even if you have deleted the A/C.

        Helpful (0)
        Post Your Question
        4 More Questions
        i have an a/c delete on my 92 gt are these ok to install with that mod in place? 1 answer
        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. 1 answer
        Can you use the stock size serpentine belt? A different review said the belt needs to be an inch bigger, is this true? 1 answer
        What are the dimensions of the pulleys? Diameter specifically 1 answer

          Customer Reviews (62) Write a Review

          Overall Rating 4.7

          out of 5 stars

          Installation Time:Less than 1 Hour

          Installation Cost:0-$100

          • Performance Gain 4.232143 4.2
          • Fit 4.767857 4.8



          • 5/5

            Installation Time: Afternoon

            October 20, 2019

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

            A little bling

            This is a great set of underdrive pulleys with excellent manufacturing quality. The stock water pump pulley took a bit of persuasion to remove but once that was off the installation went quite easily. It is hard to be sure but the car did feel a bit more responsive to throttle input and peppy after the installation.

            RickTamiS

            Year: 1988 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            August 10, 2019

            Their black and lightweight

            I wanted a set of black aluminum pulleys and American muscle had exactly what I was looking for...AWESOME

            Turbofox92

            Year: 1991 Submodel: LX

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            June 13, 2019

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

            Great Product

            Everything bolt as it should. the parts feels and looks quality made.

            Jerrick

            Year: 1993 Submodel: GT

            Helpful (0)

          • 4/5

            Installation Time: Less than 1 Hour

            May 31, 2019

            Good

            Had some scuffs on the alternator pulley, but all in all good quality and fast shipping.

            Slow5Oh

            Year: 1993 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            May 08, 2019

            Nice product!

            Went on with no issues and reused the factory belt

            Trigr9

            Year: 1993 Submodel: GT

            Helpful (1)

          • 5/5

            Installation Time: Afternoon

            May 08, 2019

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

            Sweet and strong

            These pulleys are really nice and polished very well.

            Widgeonwing

            Year: 1989 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Afternoon

            February 14, 2019

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

            Look great

            Nice set came quick easy install really look great

            JoeG

            Year: 1989 Submodel: GT

            Helpful (0)

          • 5/5

            October 24, 2018

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

            Works beautifully on my 331 stroke motor

            Iam very please with the product!!!!! These Pullies work and fits exactly its attended to!!!!

            LorenzoW

            Year: 1984 Submodel: Other

            Helpful (5)

          • 4/5

            Installation Time: Less than 1 Hour

            October 22, 2018

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

            Great Pulleys

            Wish it came with all the bolts and the ones I did get were not correct for my application but that was no big deal. The pulleys themselves are exceptional. I wish they had a power steering pull with this kit.

            NicholasH

            Year: 1985 Submodel: Other

            Helpful (4)

          • 5/5

            Installation Time: Less than 1 Hour

            October 15, 2018

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

            looks sweeeeeet!!

            looks and fit were excellent. my only complaint is there no PS pulley to match!!

            erikh

            Year: 1991 Submodel: GT

            Helpful (4)

          • 5/5

            Installation Time: Less than 1 Hour

            September 10, 2018

            SR Underdrives

            Quality product, durable finish on the pulleys, all hardware included for mounting, much lighter than the stock pulleys. Overall, there's nothing bad to say about these. I haven't put a ton of miles on them but I did notice a slight throttle response increase and a quicker RPM gain out of the hole. Well worth the money.

            BrandonF

            Year: 1989 Submodel: LX

            Helpful (3)

          • 5/5

            Installation Time: Less than 1 Hour

            September 10, 2018

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

            massive improvement

            Glad I added these to my stang, they look good and went on super easy. With a few other minor mods that I have done you can tell a difference in performance.

            DavidR

            Year: 1991 Submodel: GT

            Helpful (5)

          • 3/5

            Installation Time: Less than 1 Hour

            September 07, 2018

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

            Looks nice, wrong hardware

            Looks nice but wrong hardware with kit, they supply unnecessary water pump hardware (which they incorrectly label as crank pulley hardware), and dont supply the necessary crank pulley hardware since the oem bolts dont clear the shallower pulley. Disappointed.

            Brandon

            Year: 1989 Submodel: LX

            Helpful (4)

          • 5/5

            September 03, 2018

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

            Hope to be soon!

            Have,not installed yet Mustang is in body shop for paint

            RobertT

            Year: 1993 Submodel: LX

            Helpful (4)

          • 5/5

            Installation Time: Afternoon

            June 26, 2018

            Happy with the upgrade

            Everything fit the way it was supposed to. Easy to install and noticed a small uptick in power. That’s pretty much what I was hoping for.

            SaulW

            Year: 1988 Submodel: GT

            Helpful (6)

          • 5/5

            March 06, 2018

            pulleys

            Product looks to be of very good quality and workmanship.

            DarmonJ

            Year: 1991 Submodel: GT

            Helpful (6)

          • 4/5

            Installation Time: Afternoon

            January 10, 2018

            Very nice

            Was exactly what I expected The only issue was that the bolts were packed in with the crank pulley and the threads marred up the ribs for the serpentine belt other than that beautiful product will buy again for my wife’s mustang and I will recommend to my friends for sure

            DustinH

            Year: 1989 Submodel: GT

            Helpful (8)

          • 5/5

            Installation Time: Afternoon

            December 28, 2017

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

            Great buy

            I bought these pulleys for my 95 lightning. It took me a afternoon because i dont have an impact gun. I had to take my alternator off and take it to a friend's house to swap the pulleys. Other than that, they fit right on. The supplied bolts worked nice on the crank pulley. They look really nice and it feels like it freed up a couple horses. I did have to get a smaller belt though. 985 worked fine.

            SvtB

            Year: 1993 Submodel: Other

            Helpful (8)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: 0-$100

            December 18, 2017

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

            89

            Looks great on the car, will be able to add HP with the new chip!

            ChadC

            Year: 1989 Submodel: LX

            Helpful (8)

          • 5/5

            Installation Time: Afternoon

            September 06, 2017

            Five thumbs up

            Beautiful pieces and fit as they should! Lightweight and strong

            Rogerb2

            Year: 1987 Submodel: GT

            Helpful (7)

          Related Mustang Categories