FREE 1 to 3-Day Delivery on Orders $119+ Details

Talk to a Mustang Sales Tech
1-877-887-1105
M-F 8:30A-11P, Sat-Sun 8:30A-9P
$12k Summer Sweepstakes! Enter Daily>

Billet Pro Shop Underdrive Alternator Pulley; 25% Underdrive (07-09 Mustang GT500)

Item 438367
Product Image
Billet Pro Shop Underdrive Alternator Pulley; 25% Underdrive (07-09 Mustang GT500)
Verify parts fit and get product recommendations.
Mustang Sales Techs: Connect Now M-F 8:30A-11P, Sat-Sun 8:30A-9P
Call now 1-877-887-1105 Chat Now
$0.00
Want $10? Write one of the first 5 reviews
Our Price

$59.00

FREE Shipping on orders over $119 Market Price $67.85 You Save 13% ($8.85) Up to 10% off for Military & First Responders! See Details

Will this fit your Vehicle?

Select a different vehicle Help?
Update or Change Vehicle
Ship to: Columbus - 43215
Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
Add to Cart
Save for later
    Create a list
    Add to New List

    Saved - View your saved items

    We're sorry. We couldn't save this product at this time.

    or use

    Loading Indicator

      Product Information

      Description, Q&A

      Features & Specs

      Description

      GT500 alternators are prone to failure; high revs are the main culprit. These units were designed to spin at a maximum of 17 to 18000 RPM. Since the vast majority of us have modded these cars and raised the rev limiter beyond the factory setting we often see failures. Our BPS 10% underdrive pulley will keep the alternator revs within a more reasonable range while allowing sufficient charging in the lower RPM band. Save yourself an alternator and minimize the chances of failure with this 15 minute pulley swap!

      This pulley is an inexpensive insurance for the rpm issues and is highly recommended on all 2007-2014 MODDED GT500’s that spin the motor above the stock rev limiter setting (6250rpm)

      25% underdrive pulley for those who spin their built motors above 7000 RPM. We have tested on our own shop car that with the 10% underdrive at 6800 RPMs the alternator does not charge anymore. Switching out to the 25% slows it enough to keep charging even at those higher RPMs.

      Fitment:

      Details

      Billet Pro Shop P011-25

      CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

      Questions & Answers

      10 More Questions

      Will It Fit My Mustang

      • GT500 - 07, 08, 09