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BBK Underdrive Pulleys (96-Mid 01 GT; 96-99 Cobra)

Item 56007
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      Product Information

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


      • Gain Up to 15HP
      • Three Piece Kit
      • Brilliantly Polished Finish
      • Fits 96-Mid 01 GT and 96-99 Cobra


      Gain 15HP. You might not know it, but your accessories are draining up to 15HP they don't need. But you can get those ponies back by adding a set of BBK underdrive pulleys. BBK underdrive pulleys are designed so you can reduce the load your accessories put on your engine, without sacrificing cooling or charging performance.

      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. Installation normally takes about 30 minutes and full instructions are included.

      Application. These BBK underdrive pulleys are for the 1996 to Mid 2001 GT and 1996 to 1999 Cobra with a long water pump (bowed out face). Re-uses 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.

      Fitment: 1996 1997 1998 1999 2000 2001 Details

      MPN# 1555

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (33)

      Write a Review

      Ratings Summary

      4.6 out of 5 overall rating from 33 customers

      Installation Time: Afternoon

      Installation Cost: 0-$100

      • October 02, 2019

        5 2000 GT - Erecendez89 Installation Time: Less than 1 Hour


        I took me about an hot to install and once it was all good to go, I started it up and it even sounded better! That could just be me though BUT when I took it for s test drive I DEFINITELY felt a difference! I have s 2000 Mustang GT and this was my first modification. Simple and easy to do and definitely worth it!

        Helpful (1)
      • September 13, 2019

        5 1998 Cobra - Svtjim Installation Time: Less than 1 Hour

        Great product

        Good product and good price does not take very long to install

        Helpful (0)
      • April 01, 2019

        4 1996 GT - JacobC Installation Time: Afternoon

        Bbk underdrive

        Alternator and water pump work great, dont like having to bolt the factory harmonic balancer to the underdrive for crankshaft not a very clean look.

        Helpful (2)
      • October 23, 2018

        5 2000 GT - SilvesterO Installation Time: Less than 1 Hour

        Wife Loves the power

        For my wife’s 2000 Roush Felt a big difference. Highly recommend took me almost an hour to do it

        Helpful (3)
      • July 13, 2018

        4 1997 GT - JamesM Installation Time: Less than 1 Hour

        Red 97gt

        I was kind of worried about putting on the piggyback underdrive style but I wanted to dress up under the hood and steedy didn't have the polish underdrive but wow I was surprise with the bkk underdrive the car have better take off and more power in 3rd I would recommend the bkk underdrive

        Helpful (6)
      • October 20, 2017

        5 2000 GT - PedroR Installation Time: Less than 1 Hour

        B b K

        It made muy engine feel a lot smoother, and the response i feel like it improve.

        Helpful (7)
      • October 05, 2017

        5 1998 Cobra - Dieselkaos Installation Time: Less than 1 Hour


        Nice pulleys!! Only thing that I didn't understood was why would you attach the stock harmonic balancer to the new one??

        Helpful (12)
      • September 07, 2017

        5 1999 GT - BlackLighting Installation Time: Less than 1 Hour


        Light weight, easy to install and makes for a good look at the show.

        Helpful (4)
      • August 08, 2017

        4 2000 GT - KennethM Installation Time: Less than 1 Hour

        Polished Pullies.

        I was in the market for polished under drive pullies and chose the BBK. I did not want piggy back style pullies but I could not find polished versions that replaced the harmonic balancer. Steeds makes one that replaces the harmonic balancer but doesn't come polished. The BBK piggy back pulley functions well with a very noticeable improvement in performance. Coupled with the BBK all in one throttle body my 2000 GT runs GREAT. The engine breaths and rev much quicker. I would have been happy to pay more and gotten a polished harmonic balancer since I do attend numerous car shows.

        Helpful (5)
      • July 23, 2017

        4 1999 GT - lobster100 Installation Time: Shop Install Installation Cost: 0-$100

        BBK under pulleys

        Nice product, well constructed and finished. I've noticed a bit improved response. Far as horse power, no. I'm sure with add mod's and tuning there will be a difference.

        Helpful (6)

      Questions & Answers (5 answers)

      5 Top Rated Questions

      Do you need a tune after installing?

      • A tune never hurts, you would not have to do one, but we would suggest it.

      Helpful (0)

      I own a 96 cougar with the 4.6L V8 will this fit my vehicle as well?

      • Unfortunately we cannot confirm fitment with Cougar models.

      Helpful (0)

      Do the bbk underdrive pulleys require the use of the factory harmonic balancer? I see some picks without it and with it bolted to underdrive crank pulley Thanks

      • The BBK Underdrive Pulleys will require the harmonic damper/balancer bolted to the crank pulley, or engine damage could occur.

      Helpful (0)

      I have balance the stock harmonic balancer do I need to balance this one as well

      • The balancer included in this kit does not need to be balanced if used with the OEM rotating assembly. if you have a new rotating assembly, then you may wish to consider having this balanced if the balance was different than the OEM rotating assembly.

      Helpful (0)

      With a vortech supercharger bolt on, and the underdrive pullies. What belt is compatible with this set up?

      • We strongly recommend against using the BBK Underdrive Pulleys with any supercharger, as this will effect boost pressure.

      Helpful (0)
      Post Your Question

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Water pump pulley
      • (1) Alternator pulley
      • (1) Crank pulley

      Tech Specs

      Underdrive Pulley Specifications
      Year/Model: 96-Mid 01 GT;
      96-99 Cobra
      Manufacturer: BBK
      Material: Aluminum Finish: Polished
      Crank Pulley: Piggyback SFI Certified: No

      Will It Fit My Mustang

      • Cobra - 96, 97, 98, 99
      • GT - 96, 97, 98, 99, 00, 01

      Fits 1996 to Mid 2001 GT and 1996-1999 Cobra Only

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