BBK 97-04 Ford F150 Expedition 4.6 5.4 Underdrive Pulley Kit - Lightweight CNC Billet Aluminum (3pc)

When you're looking to get a little more zip out of your 4.6L or 5.4L Ford truck or SUV, a set of underdrive pulleys can make a noticeable difference. This 3-piece kit from BBK is designed for 1997-2004 F-150, Expedition, and F-250/F-350 models, and it replaces your stock crank, water pump, and alternator pulleys with lighter, slower-spinning units.

The main idea behind underdrive pulleys is to reduce the parasitic drag on your engine. Your accessories like the alternator and water pump draw power from the crankshaft. By slowing down these accessories, less engine power is used just to spin them, freeing up a few extra horsepower for the wheels. BBK machines these pulleys from billet aluminum right here in the USA, making them significantly lighter than the factory cast iron or steel pulleys. This weight reduction also contributes to improved engine response. They're designed as a direct bolt-on replacement, and you can even reuse your existing serpentine belt, which simplifies the installation.

This kit includes the necessary hardware and instructions to get them installed. While they free up some horsepower and reduce accessory drag, they are designed to maintain proper cooling and charging system function, so you won't sacrifice essential vehicle operation. Just be aware that this kit is not CARB approved and cannot be shipped to California.