Steeda Mustang Underdrive Pulleys (Mid 01-04 GT)

13 Review(s)
$30.00 (8%)
Steeda is the leader in underdrive pulley design for the 4. 6L engines. Steeda was the first to achieve SFI approval on our underdrive pulleys.

Part Number: 701 0003
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Steeda is the leader in underdrive pulley design for the 4.6L engines. Steeda was the first to achieve SFI approval on our underdrive pulleys for all 4.6L engines. Our underdrive pulleys are the only pulleys engineered through our unique partnership in Ford's technology transfer program to have the proper torsional vibration dampening characteristics for your 4.6L engine. No other manufacturer can make this claim.

Don't be fooled by other manufacturer's and their "state of the art" process claims. Steeda uses the latest technology directly from O.E. sources. Steeda's crank pulley is a one piece nodular iron, injection molded rubber design. Not a cheap "piggyback" design like many of our competitors use. Special rubber materials were chosen for their ability to absorb the torsional vibrations and their ability to withstand underhood temperatures.

Steeda's underdrive pulleys slow down accessory speed by about 25% reducing parasitic accessory drag on the engine. This drag reduction results in an increase of up to 10 horsepower and increased gas mileage! Get back the horsepower and torque your belt driven accessories steal and start enjoying better performance and gas mileage today!

Notes: 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.

Mid-2001 thru 2004 Pulley
Use Part # 701-0003 for GT , 701-0004 for Cobra/Mach1

1996 thru Mid-2001 Pulley
Use Part # 701-0001 for GT , 701-0002 for Cobra/Bullitt

2003 Mach 1 DOES NOT use alternator pulley. Crankshaft U/D pulleys in very limited surplus, order now while supplies last.

Product Benefits
  • High quality construction
  • Free up valuable horsepower

CA Residents: Cancer and Reproductive Harm WARNING

Fitment & Features


Manufacturer: Steeda Autosports

Installation Information:

Level of Difficulty: Medium
Install Time: About 1 1/2 Hours
Tools Required: Basic Shop Tools
Print Instructions: Installation Instructions

Vehicle Fitment:

Fits Model Year: 2001, 2002, 2003, 2004

Customer Reviews

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Average Customer Ratings


the best underdrive pulley kit
parts fit perfectly. Only took me 30 minutes to install because I did not use the alternator pulley. The alternator does not have enough drag to matter and slowing its rotation has caused other drivers problems with their charging systems. I would recommend this set up over any type of piggyback balancer kit. The balancer in this kit appears to be very well made and the car runs as smooth as silk with it.
Did you find this helpful?  2 of 2 Found Helpful
Spend the money!!
I recently purchased a 2001 Mustang GT that was equipped with some old school poorly engineered piggy back style under drive pulley (BBK aluminum) it looked like something that was rigged up on an episode of "Roadkill". I have used the Steeds kit before on a 2002 Mustang I owned and the fit is equal and finish is superior to factory Ford components. Yes they are more money than other brands but do you really want to cut corners on an item that connects directly to the rotating assembly of your engine and spins at times up to 6000 RPM's? Cut corners elsewhere (like on cosmetic crap) not critical engine components. This Steeda kit is a well engineered kit which is worth the money. I included photos of the junk that I took off my car. The aluminum was so soft it wore horribly at the front crank seal and on the water pump pulley. You don't want a set up like this even if it's free!!
Did you find this helpful?  4 of 4 Found Helpful
Steeda Underdrive Pulleys
Great quality and performance
Did you find this helpful?  1 of 2 Found Helpful
Verified Buyer  
Glad I bought the pulleys!
I had pretty well done every bolt on for my 4.6 2V Mustang GT that I could do ( just like everyone else who owns a New Edge ) These pulleys are the last thing I bolted on and I'm sure glad I didn't go cheap with some other brand where you just space out the balancer. The install was fairly easy. Instead of using wobble socket to get nut off alternator pulley, just remove couple of nuts and lift radiator reservoir out of the way to get a straight shot at nut.
Did you find this helpful?  2 of 3 Found Helpful
Verified Buyer  
Must have!!!
I love these so much it's a must have!!!
Did you find this helpful?  7 of 7 Found Helpful
Great mod for the money
Steeda's underdrive pulleys are a no brainer. This mod gives you 10+hp and doesn't affect drivability.
Did you find this helpful?  6 of 6 Found Helpful
A must mod!
Great upgrade for bone stock 99 4.6. Smoother normal starts in first gear, noticably more pull above 3k rpm. Charging voltage 13.77 @ idle. AC works good. No dim lights. A must mod! If your not a gearhead would not recommend you do this your self.
Did you find this helpful?  9 of 9 Found Helpful
HP/Gas Mielage
Bought this product from steeda back in 2004 for my 2001 GT, once installed i noticed a increase in horsepower, car revved up faster, ran much better, also noticed a bump up increase in gas mileage recommend this product from steeda, competitors make crap pulleys buy steeda pulleys and do it right the first time, i had that GT with the pullies for ten years and pullies were still good condition and engine running real strong
Did you find this helpful?  11 of 11 Found Helpful
Great upgrade!
Great upgrade! No issues with charging.(Mach 1 doesn't need alt. pulley). 25 mpg on the highway with 3.55 gears.
Did you find this helpful?  7 of 7 Found Helpful
no sweat
there is nothing like watching the other manufactures drop their prices in half just to get rid of them, back when I bought these they were 190 dollars, the past few years I have noticed the prices go up, there is a reason, they do their homework, build the part and test it in their backyard, when I first put them on I drove it on the highway and my car kinda freaked out, didn't wanna accelerate a whole lot, ask my dad what was up, and he disconnected the battery and we waited about fifteen minutes and everything was back to normal, that's the only problem I have ever had, from what I see and hear on reviews on other products, I am glad I went with these.
Did you find this helpful?  1 of 1 Found Helpful
Awesome product
Awsome product does what is suppose to and very easy to install. Never had a problem with the alternator not charging. I have heard other underdrive pulleys will give you issues. Highly recommend these pulleys.
Did you find this helpful?  3 of 3 Found Helpful
Benefits Galore
First things first, installation as with all of their products has been a breeze. Basic tools anyone can rent from a parts store or would have a buddy who already has them. Extra notes though for people, apply a tiny drop of blue loctite to the water pump bolts. They are low torque but it never hurts to be extra careful! Performance was clearly felt. It did change engine vibration and harmonics. No issues with undercharging or under cooling. And the feel while driving is substantial! For those only buying the Crankshaft pulley by itself, the correct belt you will need is a 945K6 from autozone. Great job to Frank and the boys at Steeda!
Did you find this helpful?  3 of 3 Found Helpful
Works as advertised
works as advertised, dyno pulls before and after showed real increase in power.
Did you find this helpful?  4 of 4 Found Helpful
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