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Steeda Underdrive Pulleys (05-10 GT)

Market Price $279.99 You Save 11% ($30.04)
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  • Item 16110
  • MPN# 701-0005-A

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Features & Details

  • 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

People Who Bought This Item Also Bought

Most Helpful Reviews

Outstanding Product

love the product, great price. u can feel the low end power gains!!!!!!!

Helpful (1)

Improved my throttle response, installation was a pain in the ...

I installed the pulleys about 4 months ago on my 2007 GT automatic. My throttle response improved instantly. When I hit the gas, especially from a stop, the car responds instantly; no throttle delay. I ...

Read More
Helpful (2)

Overall Rating 4.7 out of 5 stars
Read All 74 Reviews

Customer Photos (9) Submit Your Photo

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7 Questions / 12 Answers

Ask a Question

am planning 2 buy Steeda CAI, am confused between those Roush's, would it be any advantage having Steeda Pulleys instead of Roush ?


Helpful (0)
  • The Steeda and the Roush underdrive pulleys will give you the similar performance gains. Both will give you anywhere between 8-10 HP gains and will improve your fuel efficiency. Roush however will have a powdercoated finish and the Steeda will be a polished finish.


I just bought a 2007 GT so I'm new to the 3v. I'm just wondering, why do none of the 3v underdrive kits have an alternator pulley, but 2v and 4v 4.6L have it?


Helpful (0)
  • The 3v alternator pulley is already the correct size for the under drive pulley kit, so they don't need to sell you a new one. the older 4.6 2v/4v used an upgraded alternator pulley for their kit


Just a quick question about your UDP here. I plan on ordering it, but I need to know if it's going to effect my tune. Do I have to re tune my car after installing this UDP? Was hoping I can just toss it in there and it will add to my car instead of throwing the angry wrench icon on/check engine light.


Helpful (0)
  • The Steeda Underdrive Pulleys (05-10 GT) do not require a tune. After installing these Pulleys, you should not get any codes thrown.


Cause hotter engine temps? since the water pump pully is larger tht means it dosnt spin as fast correct? will this cause hotter coolant temps? also will these effect charging and a/c opperation as well?


Helpful (0)
  • as long as your cooling system and everything else is up to par you should have no problem. now if you have an aftermarket stereo with amps I would recommend getting a bigger alternator if you're going to put these pulleys on. I put a setup underdrive pulleys on my 91 Mustang and I put a140 amp alternator on and I have no problems I also have a aftermarket stereo hooked up.


Show 4 more answers

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!


Helpful (0)
  • You cannot use the stock water pump pulley because it is not large enough in diameter. Call Steeda and see if they can help.


Show 1 more answer

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?


Helpful (0)
  • 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.


Show 1 more answer

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Customer Reviews (74) Write a Review

Overall Rating 4.7

out of 5 stars

Installation Time:Afternoon

Installation Cost:$100-$250

  • Performance Gain 4.368421 4.4
  • Fit 5 5

  • 5/5

    Installation Time: Afternoon

    February 22, 2016

    Steeda Underdrive Pulleys

    Throttle Response Acceleration MPG gain Those are the first three things I can absolutely attest to with these. Anyone with an 05-09 knows of the little MPG guage. With full bolt ons and 4.10s I could barely scratch 5 bars. Or 21.3 MPG when calculated. Now it is a full bar improvement in all driving situations. I get six on the highway, and between four and five around town...up from three. I ran a full tank and did the math, no change in driving habits or routes. 23.6 MPG Not astronomical, but for such a simple bolt on, I am quite pleased. Now, throttle response is much better. Barely touching the gas results in fair acceleration in parking lots, or polite take offs. I cannot attest for any actual HP/TQ gains. But when you drive it before and after, you will feel easier acceleration. Not to mention the RPMs raise faster. No change in battery/alternator output. Nor increase in temp. Install was simple. The provided instructions were clear as day. My only caveat with the install. FOR AUTOMATICS. It calls for a 14mm wrench to hold the torque converter. I found a deep well socket and ratchet work flawlessly. Past that, I am thoroughly pleased and would recommend these to anyone staying NA,.a nitrous build, or turbocharger. Even rhose daily drivers, for the gains in MPG amd acceleration alone, it is a fine mod.


    Year: 2006 Submodel: GT Horizon City, TX

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    January 31, 2012

    Onlyone word of advise

    No matter how easy the install video makes it look with out the harmonic balance tool go get it! It was a gigantic hassel to get it off without it.


    Year: 2007 Submodel: GT central florida

    Helpful (2)

  • 5/5

    Installation Time: Afternoon

    October 15, 2011

    Improved my throttle response, installation was a pain in the ...

    I installed the pulleys about 4 months ago on my 2007 GT automatic. My throttle response improved instantly. When I hit the gas, especially from a stop, the car responds instantly; no throttle delay. I haven't seen much of a gain in MPG but than again most of the driving is in the city where I get about 13.0-14.0 MPG on average. I also haven't noticed much of an HP gain. I think the worst part was the installation. There were several issues I ran into. I didn't have an impact wrench so taking off the top pulleys was really hard. I have an auto, so the harmonic balancer kept rotating even when I had the emergency brake on or put the car in D or 1. I had to use a crow bar to lock it in place. I did have another person working with me so that made things a lot easier. Taking off the harmonic balancer was very annoying. I was using 3 different pulley pullers, which I rented from AutoZone and AdvanceAutoParts, but unfortunately none of them fit perfectly. The smallest pulley puller was the best but the long screw that pushes the pulley away from the engine was too short! I had to use a socket as leverage. Then when I was putting on the harmonic balancer using a torque wrench, I once again has to use a crow bar to lock the harmonic balancer in place because it kept turning. In the end, make sure you have an impact gun. This will make the whole process A LOT easier and quicker. Torque wrench is also necessary. Instead of renting just one pulley puller, get a few and make sure they are SMALL! I had 3 pulley pullers and none of them fit perfectly except the smallest one. Having another person helping you out is a huge plus. Good luck!


    Year: 2007 Submodel: GT NYC

    Helpful (2)

  • 5/5

    June 04, 2011

    Outstanding Product

    love the product, great price. u can feel the low end power gains!!!!!!!


    Year: 2009 Submodel: GT

    Helpful (1)

  • 5/5

    October 30, 2010

    pullys for the pony

    First off I'd like to thank A.M. for always providing great service, great parts, fast delivery, and free shipping. These Steeda under drive pullys really seemed to help make more hp, also helped the engine idle smoother. The installation was text book, just follow the directions provided. The finish could be better, but the price was right.


    Helpful (2)

  • 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)

  • 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

    Helpful (36)

  • 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 Submodel: GT

    Helpful (31)

  • 4/5

    Installation Time: Shop Install

    January 27, 2012

    Definitely worth it

    The Steeda Underdrive pulley was worth my money. I felt an increase in power after I first had it installed. I recommend this to anyone wanting a cheap upgrade with a boost in horsepower!


    Year: 2005 Submodel: GT Alabama

    Helpful (3)

  • 5/5

    May 13, 2011

    Great Pullies

    just had these installed yesterday. i noticed a little more get up at the low end!!


    Year: 2009 Submodel: GT

    Helpful (3)

  • 5/5

    November 17, 2010

    Another great Buy From American Muscle

    I Ordered the Steeda Mustang Underdrive Pulley System on Monday morning standard shipping. Arrived Tuesday afternoon installed on Wednesday. Installation went well! However a tip is to remove the fan to allow more room to work, it's easily removed and the additional space is well worth the time. Very happy with the results revs faster and pulls stronger.


    Helpful (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 Submodel: GT

    Helpful (17)

  • 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)

  • 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)

  • 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.


    Helpful (7)

  • 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 Submodel: GT

    Helpful (5)

  • 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)

  • 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 Submodel: GT Tacoma, Washington

    Helpful (3)

  • 5/5

    Installation Time: Afternoon

    May 27, 2014

    I love the look of this product ! The timing markings stand out much better than the competitions products

    Installed just as the instructions stated . I had to take off the electric fan, which I highly recommend because it make the removal easier.


    Year: 2008 Submodel: Bullitt Baltimore, MD, USA

    Helpful (1)

  • 5/5

    July 15, 2010

    Steeda U/D Pulleys

    Great product, Installed on my 2008 Bullitt, I can feel a noticeable difference in power. I'm very happy with this product. But, I had to use a 5mm socket to get the alternator stud out. it says it needs to be a 7mm? I don't know if its because my car is an 08 or what. But besides that SWEET PRODUCT!!

    Jason M

    Year: 2008

    Helpful (1)

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