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BBK Underdrive Pulleys (05-10 GT)

Item 56030
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      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Gain Up to 12HP
      • Brilliantly Polished Finish
      • Easy Installation
      • SFI Certified
      • Fits 2005-2010 4.6L Mustangs


      Gain 12HP. You may not know it, but your accessories are robbing your Mustang of nearly 12 horsepower. Get that horsepower back with a set of SFI approved underdrive pulleys from BBK. BBK's Underdrive Pulleys reduce the drain your accessories place on your engine, freeing up more horsepower and improving throttle response, without affecting your Pony's charging or cooling characteristics.

      Premium Quality.
      The BBK SFI-approved underdrive pulley set for your S197 4.6L is CNC machined from aluminum and steel components to ensure it will perform to the highest standards. With a brilliantly polished finish, this piece also looks great underhood.

      Easy Installation.
      The BBK SFI-approved underdrive pulley kit comes with complete instructions for an easy install and requires no other modifications.

      SFI Certified. By choosing an SFI Certified product, you're ensuring the product you choose has been made to the highest standards for quality and safety.

      Application. These BBK Underdrive Pulleys are specifically designed for use on the 2005 to 2010 Mustangs powered by the 4.6L V8 engine.

      Fitment: 2005 2006 2007 2008 2009 2010 Details

      MPN# 1653

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (25)

      Write a Review

      Ratings Summary

      4.5 out of 5 overall rating from 25 customers

      Installation Time: Afternoon

      Installation Cost: $100-$250

      • May 02, 2019

        4 2009 GT - Dan Installation Time: Afternoon


        Definitely noticed an increase in power, install was a little tedious but in the end it was worth it!

        Helpful (0)
      • December 09, 2018

        5 2006 GT - DannyK Installation Time: Afternoon

        nice upgrade

        easy to install if you follow the instruction submitted by a customer.look much better than the factory ones.would purchase again and recommend to anyone

        Helpful (5)
      • September 17, 2018

        5 2005 GT - PatrickM Installation Time: Less than 1 Hour

        BBK underdrive pulleys

        Easy to install, damper bolt could make or break the deal. Be prepared to get a tightly torqued bolt loose. I put car in 3rd gear with parking brakes on, still wasn't easy

        Helpful (5)
      • July 23, 2018

        5 2005 GT - TravisR Installation Time: Afternoon


        Had VT Performance in Oceanside install while installing BBK throttle body and CAI. Everything looks great. It’s a completely different car. Would recommend these bolt ones to anyone looking to go faster yet still remain smog legal.

        Helpful (6)
      • March 04, 2018

        5 2005 GT - AlexR Installation Time: Less than 1 Hour

        Easy install

        Worth the money. Quicer rev. Easy install and good add on

        Helpful (6)
      • September 30, 2017

        5 2008 GT - EdisonC Installation Time: Shop Install Installation Cost: $100-$250

        BBK Underdrive pulley

        I felt good about my purchase,there were a little complication with the new bolt but with that resolved.I notice there is some difference in performance.

        Helpful (8)
      • September 07, 2017

        5 2010 GT - ROBERTR Installation Time: Shop Install Installation Cost: 0-$100

        BBK pulleys are great!

        I have just completed having BBK Underdrive Pulleys installed on a 2010 Mustang GT that I recently acquired. The 2010 GT has an automatic transmission, so I will soon be testing out the performance. I expect good results because I already have the same BBK pulleys installed on my older 2007 GT with a 5-speed manual tranny. I have been pleased with performance on my 2007. The BBK pulleys fit well and look Great!

        Helpful (8)
      • December 01, 2013

        5 2008 GT - Alpha9500 Installation Time: Afternoon

        Looks Nice

        This is the second one I have installed and went on as expected. I bought a puller at Harbor Freight and so far it has installed two set without issues. Just buy a new crank bolt to replace the original and the install should go without any hitches.

        Helpful (7)
      • May 24, 2013

        4 2006 GT - CK42 Installation Time: Afternoon

        Great Product, just a couple catches

        These pulleys look great and they provide a noticeable gain to power and throttle response and *maybe* a 1mpg gain. Just know that a couple of 'gotchas' come with installing these. First off, I had to cut down one of the bolts on the pump because the water pump pulley was making contact, which is obviously not good. The second problem is that it is very hard on alternators. Since installing these in mid 2011 I've gone through 2 alternators because the pulley is running at a different speed and chewing them up. My next alternator is going to be more solid so hopefully it will hold up, but if you aren't willing to buy anything better than autostore brand refurbished alternators then this product is not for you.

        Helpful (9)
      • January 27, 2013

        5 2010 GT - Rick99 Installation Time: Afternoon

        Great product

        Easier to install then I expected. Looks great, more power and better gas mileage. Really a great product.

        Helpful (8)

      Questions & Answers (9 answers)

      5 Top Rated Questions

      Do you have to have a tune when changing out the pulley?

      • The BBK Underdrive Pulleys for the 05-10 GT Mustangs will not require a tune.

      Helpful (1)

      Do I use the same belt ? Form stock or I need to change with this pulley?

      • The factory belt will work with the BBK Underdrive Pulleys.

      Helpful (0)

      Will this work with a 5.4 f150 2005?

      • We are unable to confirm fitment with any vehicle other than the 05-10 Mustang GT's.

      Helpful (0)

      hi i a have supercharger edelbrock stage 2 in my mustang gt 4.6 2006 and he put underdrive pulley my question is so good or no good

      • These underdrive pulleys would work even if you have an aftermarket supercharger on your Mustang.

      Helpful (0)

      What takes up the slack on the belt from a smaller pully.Would it be the water pump pully is larger?

      • The slack is picked up by the tensioner. As long as your tensioner is good and tight it will take up the slack.

      Helpful (0)
      Post Your Question
      4 More Questions
      My mechanic use installation Bolt claiming that the original Bolt was too short to install it will it cause any problems to my car 1 answer
      Will this affect the performance of the A/C? 1 answer
      Are these compatable with the Roush m90 supercharger for a 2006 gt? 1 answer
      Bolt specs, i lost mine, need a replacement so i ordered my underdrive pulleys, havent put them on for several months, then i come to find out my bolt that came with, is missing, does Anyone know the specs about that bolt. I.E. size, thread count, and length. thank you so much!! 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Crank Pulley
      • (1) Alternator Pulley

      Tech Specs

      UnderDrive Pulley Specifications
      Year/Model: 2005-2010 GT Manufacturer: BBK
      Material: Steel Crank/ Alum Access. Finish: Polished
      Crank Pulley: One Piece Crank SFI Certified: Yes

      Will It Fit My Mustang

      • Bullitt - 08, 09
      • GT - 05, 06, 07, 08, 09, 10

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