Steeda Mustang Underdrive Crank Harmonic Balancer (1996-2010)

5 Review(s)
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: 031 PBU1476 SS25
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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 manufacturers 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!

Read more about Steeda Mustang Underdrive Pulleys by clicking here.

Product Benefits
  • Tuned to the proper frequency of the 4.6 engine
  • Reduced accessory parasitic drag
  • Increased rear wheel horsepower
  • Increased gas mileage
  • Smoothes out engine vibration
  • Fits 1996-2010 4.6L V8 Mustangs

CA Residents: Cancer and Reproductive Harm WARNING

Fitment & Features


Manufacturer: Steeda Autosports
Made in USA: Yes

Installation Information:

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

Vehicle Fitment:

Fits Model Year: 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010

Customer Reviews

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Average Customer Ratings


Steeda Harmonic balancer/underdrive
So Im giving this a 5 star because I had a different brand harmonic balancer and it was a night and day difference in how smooth my motor runs at high rpm! i have a decently quick N.A. 3 valve and shift at 7500. With the previous balancer I could tell there was room for improvement and the Steeda version is. thanks for making quality products.
Did you find this helpful?  3 of 4 Found Helpful
Crankshaft u/d pulley
Best one you can get imo , had the bbk piggyback it gave out in one year. The steeda one piece is by far superior to any other underdrive for modular motors.
Did you find this helpful?  2 of 2 Found Helpful
Does NOT come with install bolt
Nice balancer but DOES NOT come with the i stall bilt.
Did you find this helpful?  5 of 8 Found Helpful
Thanks Steeda!
Awesome upgrade. The install was straightforward and am happy with the results!
Did you find this helpful?  7 of 7 Found Helpful
Increase in rwhp
Saw a definite increase in rwhp! Awesome upgrade, should have done it sooner!
Did you find this helpful?  5 of 5 Found Helpful
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