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Steeda Underdrive Pulleys (05-10 GT)

71 Reviews
Our Price


  • Item #16110
  • MPN# 701-0005-A

  • Market Price $279.99
  • You Save 11% ($30.04)
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  • Gain Up to 10HP
  • Improves Fuel Economy
  • SFI Certified
  • Industry Leading Design
  • Fits 05-10 Mustang GT
Gain 10HP. You might not know it, but your belt-driven accessories steal up to 10HP. Put those ponies back under your right foot with Steeda's underdrive pulleys.

Innovative Design. Unlike any other underdrive pulley, Steeda used their unique partnership with Ford to create an innovative design that provides proper torsional vibration dampening characteristics for your 4.6L engine. And unlike other manufacturers that use a less expensive "piggyback" design, Steeda's one piece pulley is designed for maximum efficiency, durability, and power.

Premium Quality. Steeda creates this premium quality part using nodular iron and injection molded rubber for unsurpassed performance and heat resistance.

SFI Certified. Steeda was the first to achieve SFI approval on their underdrive pulleys for all 4.6L engines. By choosing an SFI Certified product, you're ensuring the product you choose has been made to the highest standards for quality and safety.

Fitment. For use on any 05-10 Mustang GT with Stock size belt.

Note: Coupon codes cannot be applied to this product.

Fitment: 2005 2006 2007 2008 2009 2010 Details

What's in the Box
  • (1) Crank Pulley
  • (1) Water Pump Pulley
Installation Info
Tech Specs
UnderDrive Pulley Specifications
Year/Model: 2005-2010 GT Manufacturer: Steeda
Material: Steel Finish: Black
Crank Pulley: One Piece Crank SFI Certified: Yes
Will it fit my Mustang?
  • Bullitt - 08, 09
  • GT - 05, 06, 07, 08, 09, 10

Most Helpful Reviews

it works great

I had this installed by a mechanic. It took a while but worth it in the end. People it works - steeda they do their homework.

Helpful (2)

10whp/8wtq Gain!

Just had the underdrive pulleys installed today. $320 for install and 2 dyno pulls before and 2 after. Install took the guy roughly 45 min. On the dyno before, it made 298whp/311wtq. After the Steeda Underdrive ...

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Helpful (36)

Overall Rating 4.7 out of 5 stars
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6 Questions / 7 Answers

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Do these pulleys work with a blower? I got these pulleys and I'm planning on putting a Keene Bell blower on it. Will these underdrive pulleys work with it or will I have to put stock pulleys back on?


  • They would work but, these pulleys slow down the "accessories" on the motor such as the alternator. This in turn would also slow down your blower pulley, so you would probably lose power putting these on with the blower. Think about it, faster blower drive, more power.


    Good Answer (0) (0)

Show 2 more answers Question Resolved

New bolt needed? It doesnt seem like this kit comes with a new alternator bolt for the water pump's clearance. Is it simply not included or is it not needed?


  • It doesn't say it comes with it, but it does. The only thing you will need is some lock tight for the crank bolt, you do reuse the crank bolt, but it's not a problem.


    Good Answer (2) (0)

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Can i use the stock water pump pulley? I LOST MY WATER PUMP PULLEY DURING A MOVE!! I was wondering if you can use the Crank pulley with the stock water pump pulley. If not, do you know anywhere i can just buy the Water pump pulley instead of buying the whole set again? Thanks for any help!


  • no you cannot use the stock water pump pulley because they are different sizes


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Customer Reviews (71) Write a Review

Overall Rating 4.7

out of 5 stars

  • 5/5

    April 29, 2009

    it works great

    I had this installed by a mechanic. It took a while but worth it in the end. People it works - steeda they do their homework.

    willie b

    Helpful (2) (0)

  • 5/5

    October 01, 2010

    10whp/8wtq Gain!

    Just had the underdrive pulleys installed today. $320 for install and 2 dyno pulls before and 2 after. Install took the guy roughly 45 min. On the dyno before, it made 298whp/311wtq. After the Steeda Underdrive Pulleys, it made 308whp/319wtq. Definitely significant gains. Torque improved everywhere by around 8wtq. Highly recommended.

    Jeff Blake

    Driving Style: Street / Strip

    Helpful (36) (3)

  • 5/5

    October 11, 2009

    Great product

    Although these pulleys were the most affordable the quality appears to be first rate, and the pump pulley has holes drilled in it unlike the one in the picture. I installed them myself and reflashed the computer for 93 octane, then went for a drive. I had previously installed a C&L cold air intake and Borla Stingers, but I did feel an improvement with the new tune and pulleys. According to everything I've read the combination of these mods should be good for an additional 40 HP on my '07 Gt and the throttle response is much improved. Installation however is a bit more involved than the directions would have you believe. After driving the front wheels on ramps I never needed to get under the car. First I tried to loosen the water pump bolts but the pump turned with the wrench. I jammed the rubber handle of a screw driver between the pulley and belt and managed to loosen 2 of the screws but not the other 2. I backed the 2 loosened screws out far enough to place a screwdriver across the screws to keep the pulley from turning while wrenching the remaining screws. I could have used a strap wrench but didn't think of it at the time. The next problem was that I couldn't get the crank pulley bolt off of my 5 speed car without an impact wrench. To do that it's necessary to remove the fan/shroud assembly along with the coolant expansion tank. I also had to remove my CAI to get the fan out but it wasn't any real problem. If I didn't have an impact wrench though, I would have been screwed. The next thing to slow me down was my pulley removal tool was too small for the pulley. A trip to the local rental place got me a puller that almost worked, The jaws were wide enough but the bolt was too short to reach the crank. I stuck a 3/4" deep socket between the end of the crank and the screw and pullet the pulley off. Everything went together ok after that but you should be aware of the problems you may run into.


    Year: 2007 Model: GT

    Helpful (31) (3)

  • 5/5

    April 02, 2010

    Steeda underdrive Pulleys

    06 Vista Blue Mustang GT. Great product! Can fel the HorsePower Gain.. Easy installation - Make sure you have a torques wrench, Impact Wrench, and harmonic balancer puller. Dont forget the silicone on the keyway...


    Year: 2006 Model: GT

    Helpful (17) (0)

  • 5/5

    August 24, 2008

    Easy Install, Nice HP

    Installation of these pulleys was a snap. Just follow the instructions and your good to go. I used an impact gun and it was very smooth. For the price its worth it, nice HP gains in low and midrange. Seems to just rev faster overall. Great buy!


    Helpful (14) (0)

  • 4/5

    October 23, 2009

    Great Product

    If you are not mechanically inclined, have this product installed professionally. Like Bob, I too had minor issues with this install. I did not have a strap wrench (you should use one regardless of trans) and had to put the trans in first & use the parking brake to keep the crank shaft from turning. Minor, but it was a hassle. The kit SHOULD come with a new lower dampner/pulley bolt. The factory bolt is torque to yield & should not be re-used - even though the instructions say you can, I bought a new one from Ford and used it. The difference is noticeable, engine rev's quicker, throttle response is better & I've seen an increase in gas mileage (on the highway). No problems what so ever with engine cooling, charging system or power steering. Good bang for the buck. Thumbs up on this one, Steeda. Thanks to American Muscle for the great deal & fast shipping!


    Helpful (9) (0)

  • 5/5

    November 02, 2010

    Another awesome product by Steeda

    Even though this took longer than two hours to install (even with the proper tools) it was worth it. I can feel the low end HP gain...not huge by any means but definitely noticeable. I buy all of my parts from AM because they always deliver on their promises, and of course Steeda makes superb parts. If you're looking for a good bolt on to start with or even as the "next step" to your monster creation...this is an excellent part.


    Driving Style: Daily Driver

    Helpful (7) (0)

  • 5/5

    March 21, 2011

    free hp gains

    Got them from AM very fast.Use a chrysler pulley removal tool to take off stock pulley.You can rent it at auto zone.The engine runs very smooth and more quite.And the extra horse power is nice.If you have more than 50,000 miles on your car like I did,change the belt to a napa belt.For $200.00 this is some good and real horse power.Use a 18mm socket and a 24 inch breaker bar,and hit it to your left to break the bolt lose.Then use impact to remove the bolt.Torque the pulley bolt to 115 foot pounds and the water pump pulley at 18 foot pounds.Use a strap wrench around the steeda pulley while you torque the stock bolt to 115 foot pounds.


    Year: 2005 Model: GT Driving Style: Street / Strip

    Helpful (5) (0)

  • 4/5

    Installation Time: Less than 1 Hour

    September 28, 2011

    Solid Product

    Bought these for my Automatic 2006 GT with only aftermarket exhaust installed and 48k miles. definitely felt better throttle response, car overall feels more responsive then before especially on the freeway, the added power has given a slightly different sound to it under load which is awesome, I love american muscle, its staff for putting up with my endless phone calls, the fact that you don't pay taxes on your purchases and free shipping (standard) Just received my next purchase, 2010 Black GT500 staggered wheels ;) which are going on tomorrow after work! next up will be cold air intake/tuner combo. Along with a handful of other goodies for my stang as the months come along. Keep up the good work AM! :)


    Year: 2006 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 3 Tacoma, Washington

    Helpful (3) (0)

  • 5/5

    September 24, 2009

    Great Product

    Great Product for the price, good low end power gains and smoother revs. If your not mechanically inclined it might be a little difficult just make sure you take your time and follow the instructions and itll be worth it in the end


    Helpful (6) (2)

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