Free Shipping On Orders Over $49. Details

Talk to a Mustang Expert
1-888-332-7930
Mon - Sun, 8:30 AM EST - 11:00 PM EST
Win A 700+ HP 2018 RTR Spec 3 Mustang Enter Now!

SR Performance Underdrive Pulleys - Polished (96-Mid 01 GT)

Market Price $96.99 You Save 12% ($12.00)
Our Price

$84.99

FREE Shipping
  • Item 41129
  • MPN# 41129

Local Install Shops

Quoted installation from $125

View 3 Shops

near 19355 (change)

Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
In Stock Ships same business day.
Ship to: ASHBURN - 20146
Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
Choose options to add to cart
    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 10-15 Horsepower
    • Complete 3 Piece Kit
    • Durable, Lightweight Aluminum
    • Brilliant Polished Finish
    • Premium Quality Construction
    • Fits 1996-Mid 2001 GT Mustangs

    Review & Installation Video

    Review & Install Video

    Hey I’m Justin with AmericanMuscle.com, and I’m going to be breaking down the SR Performance underdrive pulleys, fitting the 4.6L V8 motor found in all 96-04 Mustangs. Engine accessories like the AC compressor, water pump and alternator can really rob your car of horsepower, a great example of how an accessory can really eat up is whenever you turn your car’s AC on, and instantly everything feels a little more sluggish. This is referred to as parasitic drag. The job of an underdrive pulley is to turn the different accessories at a different speed by using a different sized pulley, thus requiring less amount of energy from the engine to turn the accessory belt. This reduction in drag on the crank shaft will allow the engine to work more efficiently, and should equate to more power at the rear wheels. The SR Performance kit does include a brand new crank pulley, a new water pump pulley which will differ depending on your year, a new alternator pulley, and all the hardware and spacers needed for the install. All 3 pulleys have been made from lightweight aluminum and feature a nice bright polished finish, which should definitely help the appearance side of things underneath the hood. As far as the install is concerned, it really shouldn’t be all that bad, ideally, you should have a torque wrench on hand before you get started, as well as some high temp RTV sealant and a breaker bar for that crank pulley. Again this isn’t the hardest job, but you should expect to spend about 2 hours getting everything bolted up. If you should have any problems, you can always reference the detailed instructions along with pictures located on this product page. So if you’re looking to take some of the drag off your accessories, in turn freeing up some horsepower, and improving your throttle response, then you should definitely check out these pulleys from SR Performance, available 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 10-15 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 bright polished finish that will give your engine bay an eye-catching high performance appearance.

    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 Polished Aluminum Underdrive Pulley Kit is designed for use on 1996 to 2001 GT Mustangs equipped with the SOHC 4.6L V8 engine and the a long water pump (bowed out face). Reuses factory belt.
    Technical Note. Midway through the production run for the 2001 model year Ford changed the design of the water pump on the 4.6L engine. The older style pump produced from 1996 to mid 2001 had a longer shaft. In January of 2001 the design of the pump was changed to a shorter shaft. This necessitated a change in the design of the pump pulley.

    Click here to see pictures of the different pulley styles.

    Fitment: 1996 1997 1998 1999 2000 2001 Details

    What's in the Box
    • (1) Crank Pully
    • (1) Water Pump Pully
    • (1) Alternator Pully
    • (4) Bolts
    • (3) Washers
    • (2) Spacers
    • (1) Instruction Sheet
      Hardware included:
    • None Required
    Installation Info
    Tech Specs
    Underdrive Pulley Specifications
    Year/Model: 96 to Mid 01 GT Manufacturer: SR Performance
    Material: Aluminum Finish: Polished
    Crank Pulley: Piggyback SFI Certified: No
    Will it fit my Mustang?
    • GT - 96, 97, 98, 99, 00, 01

    People Who Bought This Item Also Bought

    Customer Photos (16) Submit Your Photo

    View All 16 Photos

    You Might Also Like

    16 Questions / 6 Answers

    Ask a Question

    does the harmonic balancer connect to the crank pulley??

    JosephK

    • The harmonic balancer will connect to the crank pulley in the SR Performance Underdrive Pulley Kit.

      AshleyK

    Helpful (0)

    Hi AM. Will these pulleys fit my 1998 Mustang GT automatic? Thank you.

    Andrae

    • This SR Performance 3-Piece Polished Aluminum Underdrive Pulley Kit is designed for use on 1996 to 2001 GT Mustangs equipped with the SOHC 4.6L V8 engine

      Ricky36

    Helpful (0)

    If I buy underdrive pull set it comes with harmarnic balancer

    HerbertP

    • The SR Performance Underdrive Pulleys come with the crank pulley but does not include a harmonic balancer.

      TerriB

    Helpful (0)

    What size belt do I need.

    Ty20

    • The SR Performance Underdrive Pulleys will reuse the factory belt.

      VincentV

    Helpful (0)

    if i changed my harmonic balancer and if i get all the other pulleys separately will it be the same result or no

    Jornelas97

    • In order to get the same effect, you would need pulleys of the same diameter as the SR Performance Underdrive Pulleys, as the power gain comes from changing the pulley sizes to reduce accessory drag.

      Rob D

    Helpful (0)

    Will this work for an 4.6 3V 07 GT?

    George

    • This particular set of SR Performance Underdrive Pulleys is for the 96-mid 01 GT. However, we do carry a set for the 07 GT that can be found here: https://www.americanmuscle.com/stack-racing-sfi-pulleys.html

      VincentV

    Helpful (0)

    More Products You Might Like

    Customer Reviews (42) Write a Review

    Overall Rating 4.3

    out of 5 stars

    Installation Time:Afternoon

    Installation Cost:$100-$250

    • Performance Gain 4.108108 4.1
    • Fit 4.513514 4.5



    • 4/5

      Installation Time: Less than 1 Hour

      February 18, 2018

      Great addition to my car

      I bought these back in September but could install them right away because my car had the short water pump and I needed the longer one. I finally got around to getting a new water pump and put them on.. it took about thirty minutes to install them had to rent a harmonic balancer puller but that was it.

      DeanB

      Year: 2001 Submodel: GT

      Helpful (1)

    • 4/5

      Installation Time: Less than 1 Hour

      February 15, 2018

      Not Noticeable, But Not Bad.

      I installed these on my stock 2000 Gt over a year ago, and they haven't caused any problems. I couldn't tell a difference once they were on, but that is to be expected with smaller modifications. I've had no electrical issues, and no ill effects. The one thing I don't like is that it doesn't replace the harmonic balancer, one of the pulleys bolts on to it. This is clearly communicated on the website, I just didn't notice.

      Willy

      Year: 2000 Submodel: GT

      Helpful (1)

    • 4/5

      Installation Time: Afternoon

      October 08, 2017

      Sr performance under pulleys

      Well it was a little difficult to get to balancer in the crank pulley two seat together and the bolt kind of came loose a little bit and I had to retorque them a couple times but other than that wasn't hard at all and I'm semi please

      AdamG

      Year: 2000 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      September 02, 2017

      Purple Rain

      Gives the car a huge boost. Love it. Brightens up the engine bay as well with the chrome. Jus a great part to have installed

      Blac749

      Year: 1996 Submodel: GT

      Helpful (1)

    • 1/5

      Installation Time: Afternoon

      August 22, 2017

      Walk Away

      Thought it would be a good buy for the price, its priced so cheap for a reason. I do NOT recommend this product to anyone unless you have money to just throw away. The crank pulley warped and yolked out from the center throwing everything out of balance. If your looking to pretty your engine and dress it up this is for you. Not for any one person looking to actually release some of that tension for performance gains. You will be paying for labor twice within the 1000 miles of those pulleys being ran. I would give this less than 1 star if i could.

      detroitaluminum

      Year: 1997 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      July 17, 2017

      under drive pulleys

      Easy install noticeable difference when a.c. is on

      OmarB

      Year: 1999 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      July 06, 2017

      Great deal

      Fit in perfectly and i could feel that the throttle response bttr

      Flash22

      Year: 2000 Submodel: GT

      Helpful (1)

    • 1/5

      Installation Time: Less than 1 Hour

      June 22, 2017

      do not buy

      Order the one from steed a that replaces the harmonic balance. This one just bolts to the balance and vibrates rally bad. DO NOT BUY.

      Louie

      Year: 2003 Submodel: GT

      Helpful (6)

    • 4/5

      Installation Time: Afternoon

      June 14, 2017

      Underdrive pulleys

      So I had these for sometime but lacked the tools to install, today I installed them and I have to say on older cars such as my 2000 it wasn't as straightforward putting on the crank pulley, the key that's provided is what worries me, it's held in by sealant, I believe it should be a set screw type setup in case during installation it gets pryed up, also a tip for mating the two crank pillows together...clean the old one with fine grit sandpaper and clean with whatever, it's hard to mate them, also don't forget to remove the stock washer once you remove your crank bolt, you cannot remove your pulley with it installed, but also reinstall when finishing up. Never noticed any power difference, but some surging issues I had with my Mix and window climate control settings seem to be gone, not sure if it's related but whatever I did worked.

      Andrew1972

      Year: 2000 Submodel: GT

      Helpful (1)

    • 4/5

      Installation Time: Afternoon

      May 20, 2017

      Good

      My take is a little better.. still have a long way to go tho. But American muscle really helps when u call... I love dealing with them.

      MauriceM

      Year: 1999 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      April 30, 2017

      Suoer upgrade!

      This was such an easy upgrade! Did it in the apartment parking lot! And I got a huge increase in throttle response - it jumps now when I push it! Excellent upgrade for the money! AM does it again!

      daveair

      Year: 1997 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      March 31, 2017

      great product

      Good product easy installation highly recommend. So far Happy with the product looks great also.

      JoshuaD

      Year: 2000 Submodel: GT

      Helpful (1)

    • 4/5

      Installation Time: Less than 1 Hour

      March 13, 2017

      Good fit and finish

      This product looks good, performs well and is reasonably priced. I wasn't crazy about stacking the harmonic balance on top of the crank pulley, but that worked out better than I expected.

      JamieM

      Year: 2000 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      February 07, 2017

      Nice product

      Easy install with a good look to it. Definitely worth the buy

      EricB

      Year: 1997 Submodel: GT

      Helpful (2)

    • 3/5

      February 06, 2017

      Very happy.

      Received them not long ago. Very happy so far. Have not installed yet but will update when I do. Came with everything advertised.

      MustangRacer89

      Year: 1996 Submodel: GT

      Helpful (2)

    • 5/5

      December 27, 2016

      Love it

      I can tell a huge difference and also when I nail it from 1st to 2nd the belt doesn't squeal going across the pulleys. The shipping was very fast as it always is.

      Ponyboy

      Year: 1999 Submodel: GT

      Helpful (1)

    • 5/5

      December 16, 2016

      Power

      it's a great product add power when a/c is on runs smooth easy installation plus upgrade engine look

      Texas

      Year: 2000 Submodel: GT

      Helpful (2)

    • 5/5

      August 14, 2016

      Excellent!!!

      I wanted extra horsepower, without spending alot of money, these underdrive pulleys were the exact solution. More h.p. for little $

      Phatballlz

      Year: 1998 Submodel: GT

      Helpful (2)

    • 4/5

      Installation Time: Full Day

      July 04, 2016

      Good bang for buck

      Nice product and they look sweet install went well until the crank shaft pulley, bolts that it comes with are to small so I had to go buy new ones

      danielsrob77

      Year: 1999 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      June 29, 2016

      Great item

      Fits according specification from a vendor, is on a pretty shape at the moment to receive..

      Naviuz

      Year: 2000 Submodel: GT

      Helpful (2)

    Related Mustang Categories