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Steeda Underdrive Pulleys (Late 01-04 GT)

Market Price $268.99 You Save 11% ($29.04)
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$239.95

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  • Item 16090
  • MPN# 701-0003

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    Features & Details

    • SFI Approved
    • 8 - 10 RWHP Recovery
    • Improves Fuel Economy
    • 25% Reduction in Parasitic Accessory Drag
    • Exceeds OEM Material Specifications
    • Fits Late 2001 to 2004 GT Mustangs
    Regain Lost Power. Get back the power and torque your belt-driven accessories steal. As hard as it may be to believe, you can regain from 8 to 10 "free" horsepower with Steeda's underdrive pulleys. These pulleys reduce engine parasitic drag from your accessories by about 25% and even improve fuel economy.

    Superior Materials. Steeda underdrive pulleys are manufactured from nodular iron, and far exceed the quality of the factory pulleys. The one-piece crankshaft pulley uses a high-tech injection molded bonded rubber damper, making it far more durable than other manufactures "piggyback style" underdrive pulleys.

    SFI Approved. Steeda underdrive pulleys are SFI approved for use by all major race sanctioning bodies.

    Application. These Steeda Underdrive Pulleys are specifically designed for use on the Late 2001 to 2004 4.6L V8 GT Mustangs.Re-uses factory serpentine belt.

    Note: Coupon codes cannot be applied to this product.



    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: 2001 2002 2003 2004 Details

    What's in the Box
    Hardware included:
    • Crankshaft pulley
    • Water pump pulley
    • Alternator pulley
    • Crankshaft pulley starter bolt*
    * must be removed after seating pulley!
    Installation Info
    Tech Specs
    UnderDrive Pulley Specifications
    Year/Model: Late 01-04 GT Manufacture: Steeda
    Material: Steel Finish: Black
    Crank Pulley: One Piece Crank SFI Certifited: Yes
    Will it fit my Mustang?
    • GT - 01, 02, 03, 04

    Fits Mid 2001 to 2004 GT's Only

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    Customer Photos (11) Submit Your Photo

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    10 Questions / 10 Answers

    Ask a Question

    Can they be used with any belt driven supercharger

    Trigger

    • The Steeda Underdrive Pulleys will work on a late 01-04 GT with a supercharger.

      AshleyK

    Helpful (1)

    Do I need to buy a more powerful alternator when fitting these pulley's as some of the comments suggest? I recently bought a remanufactured stock alternator and I want to know if that is good enough for this pulley.

    MoeAli

    • They will work great if you don't have a big sound system. The only time they will show a low charge is at idle,But if your alternator is working properly you will not have a problem.

      miami01

    Show 4 more answers Helpful (1)

    Will this work with pro charged mustang?

    Adam

    • The Steeda Underdrive Pulleys will work with a Procharged Mustang.

      Pat K

    Helpful (0)

    Will the factory serpentine belt work with these? Or will i need a different length belt?

    TrentC

    • The Steeda Underdrive Pulleys will re use the factory Serpentine Belt.

      VincentV

    Helpful (0)

    Would these pulleys work well with a cammed 2v mustaqng?

    Brandon

    • The Steeda Underdrive Pulleys will work well with a cammed 2v yes.

      Ricky36

    Helpful (0)

    What is the diameter of the alt and water pump pulley? I understand it is difficult to see in photos but they look simliar to stock pulleys Can't be a big change if the stock belt is re-used unless the auto tensioner is making up for the change. I know it doesn't take a big size reduction to make small gains but I am curious of the stock diameter vs Bbk's diameter?!?!

    Anonymous

    • The diameter of the alt and water pump pulley is 6.378 inches.

      KevinD92

    Helpful (0)

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    Customer Reviews (85) Write a Review

    Overall Rating 4.7

    out of 5 stars

    Installation Time:Afternoon

    Installation Cost:$100-$250

    • Performance Gain 4.15 4.2
    • Fit 4.95 5.0



    • 5/5

      Installation Time: Afternoon

      October 22, 2017

      AWESOME INCREDIBLE

      Theses were way better than the BBK under drive pulleys, regarding the harmonic balancer dampener is all one unit....

      JohnY

      Year: 2004 Submodel: GT

      Helpful (0)

    • 5/5

      October 18, 2017

      good bolt on for a 5-8 hp gain

      nice product!!! easy bolt on install.....AM was great answering questions and helping with an issue I had with another product....This combined with my catback exhause and cold air intake (all purchased through AM) made a big difference in "funability"

      DavidN

      Year: 2003 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Less than 1 Hour

      October 07, 2017

      Nice Pulleys

      Direct replacement and well worth the money. Noticeable throttle response and mid torque pull. Make sure to get a new crankshaft harmonic balancer bolt. If your alternator has the thin nut with the lock washer i highly advise getting the flanged nut for your alternator pully to prevent stripping due to slightly thicker alternator pulley. Great buy!

      CharlesM

      Year: 2004 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Less than 1 Hour

      September 27, 2017

      Much better than Piggyback Pulleys

      Steeda Pulleys fit perfectly. I originally installed a set of piggyback pulleys and removed them before I started the engine. Do yourself a favor and buy these instead of the other options. The quality difference is night and day. I'm not sure about power gains since these were installed on a new motor with different cams.

      MichaelS

      Year: 2002 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Full Day

      September 10, 2017

      Nice product..

      First, if you don't have an impact wrench and a puller, get one as you'll need it. Also, plan on a full day to install. For the wrench to fit I had to pull the radiator. This was not a bad thing as my lower radiator hose was shot and collapsed. I went ahead and replaced the thermostat as well. The performance gain was really noticeable. Between the unrestricted hose and the pulleys, the motor revs up faster. Worth the price and effort, especially if you haven't serviced your coolant system recently.

      AlaskaStang

      Year: 2004 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      August 29, 2017

      Steeda pulleys

      Great choice. Makes the car peppy. The car revs easyier now probably more noticeable since I have a manual. Slightly harder to steer into parking spots at a idle. The car warms up slightly faster but the fan keeps up no problem. No issues with my battery got 5 year warranty on it anyways. I recommend this product. The car gets 8.8l/100k now used to be 9. I would do it again!

      Kevin

      Year: 2002 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Less than 1 Hour

      August 22, 2017

      Steeda Quality!

      From fit to finish- no regrets! These pulleys are as advertised!

      06Bill

      Year: 2006 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      June 27, 2017

      2004 Mustang GT with Steeda Pulleys

      Really happy with them! They look factory which is nice so people don't notice the difference. I had a mustang priority this one and did the bbk but these seem a lot higher quality. Hardest Pulley was the crank but if you have a pulley puller you will be fine. Highly recommend

      CarloJ

      Year: 2004 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      June 09, 2017

      Great Pulleys!!!

      Do not make the same mistake I did. Save your money, but these pulleys. I bought a couple of different pulleys before finding these. These are Great Quality and fit perfect with Zero deflection! A Great Job Steeda!

      AlexP

      Year: 2003 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Less than 1 Hour

      May 01, 2017

      Steeda!!

      can't go wrong with these. Wasn't sure it would give me noticeable gains because of what some people say on here but once installed I actually noticed a difference. Definitely worth the money!

      Kenneth

      Year: 2004 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      March 30, 2017

      Fantastic product and great quality

      Installed these on my 04 gt and it really woke up my car. Getting the crankshaft bolt off was a huge pain but once you that was off it was smoothe sailing. You will need to use a harmonic balancer puller to get the harmonic ballencer off of the crank. Great product and worth the paying a little extra for a quality product.

      Dwright

      Year: 2004 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      January 10, 2017

      Highly Recommend

      Installation was very straight forward. I personally couldn't see installing picky backs when you get a nice balancer with the kit. If you have the right tools, you could do it in an hour or so. Don't expect mind-blowing gains. The engine does run much smoother and snappier. Throttle response is greatly improved.

      BK

      Year: 2001 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Afternoon

      November 03, 2016

      the best pulleys for a 99 through 04 GT

      These pulleys are the best in my opinion that you can buy for the 99 -04 Mustang GT Much better than the playback system Like other pulleys have the only unfortunate problem I did have was that I over torque my alternator pulley bolt nut and I had to pay another $205 for another alternator but I was replacing all the serpentine pulleys That's why I was doing this insulation so Overall I'm happy with the outcome and I can feel a little more power

      jason

      Year: 2003 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      December 23, 2015

      Steeda Underdrive Pulleys

      I have a highly modified 4.6L two valve drag car, that I also keep legal for the street. Because of my speed in the quarter mile I must use SFI rated parts for safety. Steeda parts, are always of the highest quality and meet the highest design standards, often working with Ford in design. Installation is straight forward, a trick to use when loosening the alternator nut is to loosen it while the serpentine belt is on, this also works with the water pump bolts. After loosening the bolts you can remove the serpentine belt. Pulling the old balancer is straight forward, put your car in gear with a standard transmission and with a puller that you can get, from a lot of auto parts stores, by borrowing their tools, remove the old balancer. Use the Steeda supplied torque specs and its an easy job that can be done in a little over an hour. Since under drives are larger than factory pulleys, always check for clearance and anything that can rub on the serpentine belt. I had to trim a protruding stud, with my Dremmel tool.

      pilot

      Year: 2002 Submodel: GT St. Charles Mo.

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      June 25, 2015

      Steeds under drive pullys

      Good price on the pulleys wanted a name brand great Quality . nice finish on pullys. improved aceleration easy to assemble buy the belt I ended up getting it afterwards.

      terry964

      Year: 2004 Submodel: GT Buffalo

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      July 07, 2014

      The best UD Pulley system for the 99-04 GT period

      This is the best. Steeda does not use the Piggie back system like all the other systems. This is the best and it is designed by Steeda with Fords help to be a exact fit for this car and maintain stock characteristics but add 15 horses!!! Great product!!

      wwwhittl

      Year: 2002 Submodel: GT Tallahassee, FL, USA

      Helpful (1)

    • 4/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      June 28, 2014

      Steeda Underdrive Pulleys

      Steeda is a quality product and the crank pulley is much preferred over the "piggyback" type in other kits. You get what you pay for.

      Woody0513

      Year: 2003 Submodel: GT Yorkton, SK, Canada

      Helpful (0)

    • 5/5

      Installation Time: Less than 1 Hour

      June 17, 2014

      Nice setup

      This is a top shelf unit with a new harmonic balancer with nice degree marks for timing some of the orher kits are "piggyback" style and bolt over your old balancer. In my application I had no clearance for the other style this is a nicer looking and much better unit.

      65cobra

      Year: 2002 Submodel: GT Long Island, New York, USA

      Helpful (0)

    • 5/5

      Installation Time: Less than 1 Hour

      June 08, 2014

      Smooth!

      These are a great set of pulleys! They come with everything you need. Balancer and all! I highly recommend!!

      PACMAN96

      Year: 2002 Submodel: GT Augusta, Ga

      Helpful (0)

    • 5/5

      April 14, 2014

      Sounds amazing

      These pulleys take this sound to a whole new level my Mustang sounds great.

      04gtmustang

      Year: 2004 Submodel: GT Miami,Fl

      Helpful (0)

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