The ACT GM9-HDSS pairs ACT's Heavy Duty pressure plate with its Performance Street sprung disc for a stronger-holding, street-friendly clutch kit across GM's LS-series Camaro, Corvette, Firebird, GTO, and Trailblazer SS applications. The Heavy Duty pressure plate uses ACT's exclusive diaphragm design to increase clamp load and reduce deflection, and every diaphragm goes through a four-stage heat-treating process for consistent performance. The Performance Street disc uses premium organic friction material with high copper content for improved heat transfer, plus steel-backed lining for greater burst strength and durability, with reduced marcel for faster, crisper shifts. Installation requires a flat flywheel, or the ACT 600585 flywheel on LS2/LS3/LS7 applications.
Specifications:
- Torque Capacity: 709 ft-lb (42% over OE)
- Product Weight: 29.8 lbs
- Disc Diameter: 11 in (280 mm)
- Pressure Plate: Heavy Duty, four-stage heat-treated diaphragm
- Disc Material: Organic, high-copper content, steel-backed lining
- Disc Style: Sprung hub
- Fitment Requirement: Requires a flat flywheel, or ACT 600585 flywheel for LS2/LS3/LS7
- Pedal Feel: Light to moderate effort, smooth positive engagement, OE to mild gear rattle
- Recommended Use: Street and race use
- Part Number: GM9-HDSS
Vehicle Applications:
- 1998 Chevrolet Camaro Z28
- 1999 Chevrolet Camaro Z28
- 2000 Chevrolet Camaro Z28
- 2001 Chevrolet Camaro Z28
- 2002 Chevrolet Camaro Z28
- 1998 Chevrolet Camaro Z28 SS
- 1999 Chevrolet Camaro Z28 SS
- 2000 Chevrolet Camaro Z28 SS
- 2001 Chevrolet Camaro Z28 SS
- 2002 Chevrolet Camaro Z28 SS
- 2003 Chevrolet Corvette 50th Anniversary Edition
- 2003 Chevrolet Corvette 50th Anniversary Edition Pace Car
- 1997 Chevrolet Corvette
- 1998 Chevrolet Corvette
- 1999 Chevrolet Corvette
- 2000 Chevrolet Corvette
- 2001 Chevrolet Corvette
- 2002 Chevrolet Corvette
- 2003 Chevrolet Corvette
- 2004 Chevrolet Corvette
- 2005 Chevrolet Corvette
- 2006 Chevrolet Corvette
- 2007 Chevrolet Corvette
- 2008 Chevrolet Corvette
- 2009 Chevrolet Corvette
- 2010 Chevrolet Corvette
- 2011 Chevrolet Corvette
- 2012 Chevrolet Corvette
- 2013 Chevrolet Corvette
- 2010 Chevrolet Corvette Grand Sport
- 2011 Chevrolet Corvette Grand Sport
- 2012 Chevrolet Corvette Grand Sport
- 2013 Chevrolet Corvette Grand Sport
- 1998 Chevrolet Corvette Indianapolis 500 Pace Car
- 2001 Chevrolet Corvette Z06
- 2002 Chevrolet Corvette Z06
- 2003 Chevrolet Corvette Z06
- 2004 Chevrolet Corvette Z06
- 2006 Chevrolet Trailblazer SS
- 1998 Pontiac Firebird Formula
- 1999 Pontiac Firebird Formula
- 2000 Pontiac Firebird Formula
- 2001 Pontiac Firebird Formula
- 2002 Pontiac Firebird Formula
- 1998 Pontiac Firebird Trans Am
- 1999 Pontiac Firebird Trans Am
- 2000 Pontiac Firebird Trans Am
- 2001 Pontiac Firebird Trans Am
- 2002 Pontiac Firebird Trans Am
- 2004 Pontiac GTO
- 2005 Pontiac GTO
- 2006 Pontiac GTO
Warning: This product can expose you to chemicals including carbon black, glass wool fibers, or silica (in clutch discs), chromium and nickel, which are known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov
FAQ
What torque capacity does the GM9-HDSS handle?
The kit is rated for 709 ft-lb of torque capacity, a 42% increase over the factory clutch on these LS-series platforms.
What flywheel does the GM9-HDSS require?
It must be used with a flat flywheel, or with the ACT 600585 flywheel on LS2/LS3/LS7-equipped applications.
What vehicles does the GM9-HDSS cover?
It spans a wide range of GM LS-series platforms, including the 1998-2002 Camaro Z28/Z28 SS, 1997-2013 Corvette (including Grand Sport and Z06), 2006 Trailblazer SS, 1998-2002 Firebird Formula/Trans Am, and 2004-2006 Pontiac GTO. See the Vehicle Applications list above to confirm the exact year and trim.
Is this kit suitable for daily driving?
Yes. It is engineered for light to moderate pedal effort with smooth, positive engagement and only OE to mild gear rattle, and is recommended for both street and race use.