Improve throttle response and add power throughout your RPM range by reducing the amount of power you're losing to your accessories. And best of all, you don't have to sacrifice your A/C or charging performance - you can free up as much as 15HP with a set of BBK underdrive pulleys for your GT without negatively affecting your Mustang's ability to keep you cool.Premium Quality.
Made of aircraft quality aluminum alloy, these BBK aluminum pulleys won't weigh you down.
Hand Polished. The brilliant polished finish of these underdrive pulleys will give your engine bay a high performance look.
Easy Installation. This BBK Underdrive Pulley kit installs quickly and easily in under 2 hours with no modifications required.
Application. These BBK underdrive pullies are designed to fit the Late 2001 to 2004 GT Mustangs with the short water pump pulley with a bowed in face. Re-uses stock factory serpentine belt.
Technical Note. 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.
Click here to see pictures of the different pulley styles.
2001, 2002, 2003, 2004 Details >>