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Spec Billet Steel Flywheel - 8 Bolt (99-Mid 01 GT; 96-04 Cobra; 03-04 Mach 1)

Market Price $340.99 You Save 11% ($37.94)
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  • Item 60010
  • MPN# SF84S

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Features & Details

  • SFI Certified.
  • 8 Bolt.
  • Machined to Precise Specs.
  • Billet Steel.
  • Fits 99-Mid 01 GT, 96-04 Cobra, and 03-04 Mach 1.
Premium Quality. Designed and weighted for the perfect balance and surface to complement your new clutch, a SPEC billet steel flywheel is the perfect addition to your GT, Cobra, or Mach 1's drivetrain. And unlike other brands, SPEC's billet steel flywheels are machined to a precise tolerance of .001 that ensure your new flywheel will perform to the highest standards. Unlike cheaper options, these flywheels are also SFI certified for peace of mind.

Protects Your Investment. When replacing your clutch you have two options: resurfacing your flywheel, or getting a new flywheel. Most times, getting a new flywheel is better than resurfacing, as the flywheel will dictate how well your clutch will perform, as well as how long it will last.

Rebuildable. A cheaper flywheel won't stay that way - SPEC's steel flywheels have a replaceable steel friction plate which makes this flywheel rebuildable. And this flywheel surface is also made from a special type of steel specifically designed to help your new clutch "bed in" properly and to promote superior grip - so this might just be the last flywheel you ever have to buy.

SFI Certified. If you're using this flywheel in high performance or racing applications, SFI Certification is critical so you can run your Pony at the track or strip. And it's great for peace of mind even in a daily driver - at higher RPMs, stock cast flywheels have been known to explode.

Application. This Spec Flywheel is designed for 99-Mid 01 GT, 96-04 Cobra, and 03-04 Mach 1 with the 8 bolt main.

Technical Note. This SPEC Billet Steel flywheel has an 8 bolt main that is found in the 1999-mid 2001 Mustang GT's with production date ending on 06/01, 1996-2004 Mustang Cobra's and 2003-2004 Mach 1's. 

Please Note. Romeo built engines have 6 bolt cranks and Windsor built engines have 8 bolt cranks. If the 8th character in the VIN is an "X" its a Windsor block, if the 8th character in the VIN is a "W" it is a Romeo block. There is an exception to that rule as the 2001 Bullitt Edition Mustang feature a Romeo built engine. If unsure please check with your Ford dealer to determine if you have a 6 or an 8 bolt main.

Fitment: 1996 1997 1998 1999 2000 2001 2003 2004 Details

What's in the Box
  • (1) Flywheel
Installation Info
Tech Specs
Flywheel Specifications
Year/Model: 99-Mid 01 GT, 96-04 Cobra, and 03-04 Mach 1 Manufacture: SPEC
Material: Billet Steel Bolt Pattern: 8 Bolt
Hardware Included: No SFI Certifited: Yes
Will it fit my Mustang?
  • Bullitt - 01
  • Mach 1 - 03, 04
  • Cobra - 96, 97, 98, 99, 01, 03, 04
  • GT - 99, 00, 01

Fits Manual 99-Mid 01 GT, 2001 Bullitt, 96-04 Cobra, and 03-04 Mach 1 Mustangs with a 8 bolt main only

Most Helpful Reviews

Billet steel flywheel

Great part! Very good quality. Perfect fit. Thanks A.M.

Helpful (2)

Fast Delivery

Product was delivered quickly and is as pictured.

Helpful (2)

Overall Rating 4.8 out of 5 stars
Read All 16 Reviews

Customer Photos (8) Submit Your Photo

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1 Questions / 1 Answers

Ask a Question

Will this flywheel work with a OEM clutch or will i need to get a another one


  • The Spec Billet Steel Flywheel - 8 Bolt (96-04 Cobra, Mach 1; 99-Mid 01 GT) will work with an OEM clutch. However, I would recommend getting a new clutch. when you change out a clutch or flywheel, it is best to also change the other part as you will get the best performance out of your drivetrain.


Helpful (0)

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Customer Reviews (16) Write a Review

Overall Rating 4.8

out of 5 stars

Installation Time:Afternoon

  • Performance Gain 3.888889 3.9
  • Fit 4.444445 4.4

  • 5/5

    June 01, 2010

    Billet steel flywheel

    Great part! Very good quality. Perfect fit. Thanks A.M.


    Helpful (2)

  • 5/5

    September 16, 2009

    Fast Delivery

    Product was delivered quickly and is as pictured.


    Helpful (2)

  • 5/5

    October 08, 2008

    I like it

    Wow, what an improvement! Acceleration is better, it sounds and feels less hesitant, and the engine sounds more free. I love it!


    Helpful (2)

  • 5/5

    July 28, 2008

    SPEC Billet Steel Flywheel

    So far, it works great with no problems!


    Helpful (2)

  • 5/5

    January 22, 2008

    Billet Steel Flywheel

    Another great product from American Muscle. Flywheel looks great. Wonderful product, thank you.

    Josh Conrad

    Helpful (2)

  • 5/5

    Installation Time: Afternoon

    April 08, 2017


    I order this flywheel from AM and it was not rebuildale as it reads. AM sent me a second one and the same - it's not rebuildale. I wasted time and money because of false information. I spoke with SPECs and i was informed they "stop selling the 8 bolt steel rebuildable flywheel years ago!" All the other high performance websites have the current information from SPEC. I don't understand why AM doesn't have the current information because they do not have any old stock "8 bolt steel SPEC flywheels." The two I tried purschasing were dropped shipped from SPEC. I love AM but this is not the first time i have been given totally wrong information that led to wasting time and money!!!


    Year: 1999 Submodel: Cobra

    Helpful (1)

  • 3/5

    Installation Time: Afternoon

    March 16, 2017

    AM is behind on this products features

    I ordered this for my 99 Mustang GT as it requires the 8 bolt pattern. The rebuild-ability of this particular part is not true, as I uploaded a photo to show. I received 2 of these flywheels in sealed packages and they DO NOT have the insert. I spoke with a salesman at Spec and he informed me they no longer make the steel (SF84S) flywheel with the replaceable insert. If you want a flywheel with the insert you have to get the aluminum one (SF84A).


    Year: 1999 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    January 26, 2016

    A Really Nice Flywheel

    I'm very happy with my new flywheel. The flywheel i had before was in a really bad condition and after installing this flywheel i felt a big difference in the Rpm and the engine feels more free!


    Year: 1999 Submodel: Cobra Sunnyvale, California

    Helpful (1)

  • 5/5

    Installation Time: Full Day

    June 23, 2014

    Very nice flywheel for the money.

    Nice flywheel. I like that the friction surface is replaceable. I don't know exactly about installation time because I have the entire motor out for a rebuild. Its very well made.


    Year: 2003 Submodel: GT Charleston, WV

    Helpful (1)

  • 3/5

    Installation Time: Afternoon

    June 28, 2013

    Works great now

    With some mild tweaking the shop was able to align the flywheel and install it along with a Spec Stage II clutch for daily driving.


    Year: 2000 Submodel: GT Malvern, PA

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    December 29, 2012

    01 Cobra

    took it to the shop to have it done professionally. still breaking it in but it shifts better than stock. smooth and feels easy to shift.


    Year: 2001 Submodel: Cobra

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    December 08, 2011

    Good quality, too pretty to hide under the bellhousing

    Its a very nice looking piece and mine came with hex head bolts for both the 10.5 and 11" mounting locations and dowel pins to be installed where you need them based on clutch size. The dowels were a real pain to install. Had to use a quality punch and sledgehammer and took alot of pounding because they are such a tight fit and you do not want to mushroom the heads. This was the best deal i could find for an 8 bolt flywheel that could use the 10.5 clutch I had purchased and has replaceable friction surface.


    Year: 2000 Submodel: GT Orlando Florida

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    December 07, 2011

    Best bang for the buck.

    Bought this and the stage 1 clutch, I'm very happy with the feel of it. Not overly aggressive but alot more grab than stock!


    Year: 1999 Submodel: GT Williamsport md

    Helpful (1)

  • 5/5

    March 16, 2010

    SPEC clutch

    American Muscle is the only place to buy your parts. 5 star staff and products. Thankyou again for your staff and products!!

    aaron grobleski

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    June 10, 2015

    Flywheel and clutch install

    Redoing the clutch and flywheel on a 96 cobra that recently fell into my lap. Parts worked just as they were supposed to and the car is acting much better now! Always recommend AM for their fast shipping and excellent customer service.


    Year: 1996 Submodel: Cobra

    Helpful (0)

  • 5/5

    February 14, 2011

    SPEC Billet Steel Flywheel - 8 Bolt (99-Mid 01 GT, 96-04 Cobra, and 03-04 Mach 1)

    Liked that it was an oe fit! Thank you for helping us not lose the sale!!


    Helpful (0)

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