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SR Performance Underdrive Pulleys (Late 01-04 GT)

Item 388722
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      Video Review & Installation

      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


      • Gain Horsepower
      • Complete Kit
      • Durable, Lightweight Aluminum
      • Brilliant Polished Finish
      • Premium Quality
      • Fits Late 2001 to 2004 GT


      Untap Hidden Horsepower. Add some more bite to your GT's bark by reducing the amount of power you're losing to accessories and A/C. When you install this underdrive pulley kit, you'll free up up to 15 horsepower - and it's pretty much all gain and no pain, since you won't sacrifice your charging characteristics or A/C to do it.

      Premium Quality.
      Don't settle for inferior parts. These premium quality pulleys are made from lightweight aluminum for durability and performance. Made using precise, state-of-the-art CNC manufacturing, you can count on these pulleys to perform at the highest level.

      Easy Installation.
      This Underdrive Pulley kit installs quickly and easily in under 2 hours with no modifications required.

      Application. These underdrive pullies are designed for the Late 2001 to 2004 GT with the short water pump pulley with a bowed in face. Re-uses factory serpentine 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: 2001 2002 2003 2004 Details

      SR Performance 388722

      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Crank Pully
      • (1) Water Pump Pully
      • (1) Alternator Pully
      • (2) Spacers
        Hardware included:
      • (4) Bolts
      • (3) Washers
      • (1) Crank Key

      Tech Specs

      Underdrive Pulley Specifications
      Year/Model: Late 01-04 GT Manufacturer:
      Material: Aluminum Finish: Polished
      Crank Pulley: Piggyback SFI Certified: No

      Customer Reviews (100+)

        Questions & Answers

        10 More Questions

        Will It Fit My Mustang

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