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

Item 41129
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      Review & Installation Video

      Hey I’m Justin with, 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

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Free Up 10-15 Horsepower
      • Complete 3 Piece Kit
      • Durable, Lightweight Aluminum
      • Brilliant Polished Finish
      • Premium Quality Construction
      • Fits 1996-Mid 2001 GT 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 10-15 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.

      SR Performance

      Fitment: 1996 1997 1998 1999 2000 2001 Details

      MPN# 41129

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (65)

      Write a Review

      Ratings Summary

      4.3 out of 5 overall rating from 65 customers

      Installation Time: Afternoon

      Installation Cost: $100-$250

      • February 27, 2020

        2 1996 GT - Gee Installation Time: Afternoon


        Upon installing the pulleys i found that they were used parts not new.

        Helpful (0)
      • February 27, 2020

        5 2000 GT - Timl Installation Time: Afternoon

        Good product

        I’ve had these on a couple different mustangs you Can definitely feel the difference

        Helpful (0)
      • January 13, 2020

        5 2000 GT - Shyguy1969 Installation Time: Afternoon

        You can feel the difference

        Definitely makes the engine bay look alot nicer and you can feel the car accelerate quicker.

        Helpful (0)
      • October 16, 2019

        1 1998 GT - Deathstriker Installation Time: Less than 1 Hour


        I recieved my items and the pulleys were all scratched and beat up the ribs on the alternator pulley were dinged up and flat. And my water pump pulley had scratches chips and overall I'm disappointed. I like ordering things from american muscle but unfortunately I was disappointed this time

        Helpful (2)
      • July 06, 2019

        4 1998 GT - MarkT Installation Time: Afternoon


        The harmonic balancer n the water pump pulley fit perfect except install instructions say to put car in gear which I did n I had e brake on n the only way I could break bolt loose on crank was to remove fan assembly n use impact. Plus the the alternator factory pulley has spacer built into the pulley so w the new pulley n separate spacer the pulley was wobbling on the shaft until I held it just rt n impacted it down. I think the pulley should have spacer already welded to pulley cause the spacer hole was exact size n the pulley hole was bigger than shaft.

        Helpful (0)
      • June 25, 2019

        5 2001 GT - Zmeyer24 Installation Time: Afternoon

        SR Performance Review

        Awesome product and easy to install. Anyone who has a 2001 mustang gt like me and orders the wrong one just buy the longer water pump and you are good to go. Saves time so you don't have to start a return.

        Helpful (0)
      • May 20, 2019

        4 2000 GT - Andre Installation Time: Afternoon

        Bumble Bee

        The product works well and looks great on my Gt mustang. Would recommend it to other people.

        Helpful (1)
      • April 02, 2019

        5 1999 GT - Stang420 Installation Time: Afternoon


        Nice product. Good price with good quality. Happy with my purchase

        Helpful (1)
      • February 26, 2019

        5 1998 GT - WilliamA Installation Time: Less than 1 Hour


        Very easy to install, and gives your 94-98 mustang a very clean and sporty look under the hood. And you can feel a difference in speed and performance. Highly recommend as a simple bolt on!

        Helpful (4)
      • February 18, 2019

        5 1997 GT - MarkB Installation Time: Afternoon

        Very high quality for the price

        They came in very fast and are very well made. You can feel a small gain of power.

        Helpful (5)

      Questions & Answers (24 answers)

      5 Top Rated Questions

      What size belt do I need.

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

      Helpful (7)

      What is the probleme if i dont install the harmonic balancer on sr pulley

      • The harmonic dampener/balancer must be installed when installing the SR Performance Underdrive Pulleys. If it is not, the engine will be unbalanced which will create damaging vibrations that can cause many parts in the engine to fail.

      Helpful (2)

      Can I use the stock belt size or what belt size is better

      • You would use the stock belt size with these pulleys.

      Helpful (1)

      i have a 01 mustang gt how do you know if its mid or late 2001?

      • It will depend on the production month/year the vehicle was produced.

      Helpful (0)

      It says on the description of the SR Pulleys that it fits Mustang GT models from 96-2001 but then you said in the video that it fits all new edge models. So, what years is it? I have 2002 Ford Mustang Gt, would this part fit on it or would I have to make some adjustments?

      • Unfortunately, this will not work with the 02 GT Mustangs. We do have this one here that would be designed to work with your Mustang:

      Helpful (0)
      10 More Questions
      Will I have to retune the car or reset anything after I install these In my 98 gt? 1 answer
      How does this differ from the Steeda Kit? I like the fact that this kit is under 100$, but I am unsure if getting the Steeda kit with the SFI balancer attached is a better more long term decision investment for my car. Will this kit cause problems down the road? Also will the polished appearance fade over time or Rust? 1 answer
      Will it fit a Crown Victoria 1998 police interceptor? 1 answer
      We this fit on my 1996 Lincoln town car? It has the 4.6 liter. 1 answer
      does the harmonic balancer connect to the crank pulley?? 1 answer
      Hi AM. Will these pulleys fit my 1998 Mustang GT automatic? Thank you. 1 answer
      If I buy underdrive pull set it comes with harmarnic balancer 1 answer
      if i changed my harmonic balancer and if i get all the other pulleys separately will it be the same result or no 1 answer
      Will this work for an 4.6 3V 07 GT? 1 answer
      What month of the year is considerd to be mid 2001 model?? 1 answer

      Installation & What's in the Box

      Installation Info

      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

      Tech Specs

      Underdrive Pulley Specifications
      Year/Model:96 to Mid 01 GTManufacturer:SR Performance
      Crank Pulley: PiggybackSFI Certified:No

      Will It Fit My Mustang

      • GT - 96, 97, 98, 99, 00, 01

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