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Steeda Underdrive Pulleys (Late 01-04 GT)

Market Price $275.95 You Save 13% ($36.00)
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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

    CA Residents: Warning: California's Proposition 65

    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?

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    Questions & Answers (10)

    5 Top Rated Questions

    Can they be used with any belt driven supercharger

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

    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.

    • 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.

    Helpful (1) Show 4 more answers

    Will this work with pro charged mustang?

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

    Helpful (0)

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

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

    Helpful (0)

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

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

    Helpful (0)
    Post Your Question
    5 More Questions
    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?!?! 1 answer
    will these fit my 4.6l 2004 crown victoria. im aware that most mustang gt parts are compatible with crown victorias right? 1 answer
    Will this fit my 01 Bullitt? 1 answer
    Will the underdrive pulleys work with a mustang that has the mach 1000 radio option? 1 answer
    Will this work with a Mach 1000 radio option? My 2003 GT came with a Mach 1000 radio option. Will using the underdrive pulleys affect the radio and other electrical needs of the car adversely? 1 answer

    People Who Bought This Item Also Bought

    Customer Reviews (91) Write a Review

    Overall Rating 4.7

    out of 5 stars

    Installation Time:Afternoon

    Installation Cost:$100-$250

    • Performance Gain 4.152174 4.2
    • Fit 4.934783 4.9



    • 4/5

      Installation Time: Less than 1 Hour

      September 07, 2018

      great features

      I can tell the difference when install the underdrive pulleys rpm are quicker now

      MesioM

      Year: 2002 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      September 01, 2018

      Great fit

      This is my first set of under drive pullies and the install was a breeze. I also have a custom a.c. delete. Sprayed the bolt with pb blaster for three days and nights before the install. Broke the balancer loose with a breaker bar. Great fit and I can tell the engine actually benefited from this. Also running a 180 thermostat and have had no issues with cooling or charging. Definitely recommended

      LTHL281

      Year: 2004 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      May 29, 2018

      slow down and go fast

      the pulleys look to be real good quality. They were easy enough to install except the lockwasher is too thick to go back on the alternator. No difference in charging with new pulleys and temperature of engine didn't change. The steering is a little harder when moving real slow like in parking lots.

      LyndaP

      Year: 2003 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Less than 1 Hour

      April 08, 2018

      STEEDA PULLEYS!

      Got my pulleys today. Packing was perfect. Looks great finish product. Will install them soon with 4.10 gears

      MustangDubai

      Year: 2004 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Afternoon

      April 04, 2018

      Great product.

      Installation was so easy. It took me an hour and a half. I went for a test and you can feel the power right away. I'm so happy with the way my car response for throttle.

      JoseP

      Year: 2003 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Less than 1 Hour

      March 22, 2018

      Steeda Underdrive Pulleys

      Noticeable better throttle response and much noticeable response on higher RPM's, bit fuel economy as-well. Overall good quality made product.

      Grant

      Year: 2004 Submodel: GT

      Helpful (3)

    • 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 (3)

    • 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 (3)

    • 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 (3)

    • 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 (4)

    • 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 (3)

    • 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 (3)

    • 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 (4)

    • 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 (3)

    • 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 (3)

    • 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 (3)

    • 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 (3)

    • 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 (4)

    • 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 (3)

    • 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 (4)

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