ACT HD/Perf Street Sprung Kit American Motors 1958-1970

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Model#GM2-HDSS
ManufacturerACT

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ACT GM2-HDSS Heavy Duty/Performance Street Sprung Kit

The ACT GM2-HDSS kit is engineered for those seeking enhanced clutch performance without compromising drivability. This kit combines ACT's most popular Heavy Duty pressure plate with a high-performance street disc, making it an ideal choice for both spirited driving and everyday use.

Key Features

Light to moderate pedal effort for a comfortable driving experience.
Smooth, positive engagement with minimal gear rattle.
Extended friction life, thanks to ACT's exclusive diaphragm design that increases clamp load and reduces deflection.
Premium organic friction materials that withstand high temperatures and resist fade.
100% clamp load tested and dynamically balanced for reliable high RPM performance.

Specifications

Clutch Disc Diameter: 10.5 in (266 mm)
Disc Material: Organic
Input Spline Quantity: 10
Input Shaft Diameter: 1.125 in
Torque Capacity: 629 ft/lbs, offering a 32% increase over OE specifications.
Product Weight: 21.4 lbs
Pressure Plate Type: Heavy Duty

Installation Notes

For detailed installation instructions, refer to the installation guide here.

Fitment

The ACT GM2-HDSS is compatible with the following American Motors vehicles:

American Motors Ambassador (1958-1966)
American Motors AMX (1968-1970)
American Motors Classic (1965-1966)
American Motors Hornet (1970-1977)
American Motors Javelin (1969-1970)
American Motors Marlin (1965-1967)
American Motors Rebel (1967-1970)

Upgrade your clutch system with the ACT GM2-HDSS kit for improved performance and reliability on the road or track.

Other Part Numbers:
ACT #actGM2-HDSS

Proposition 65

⚠ WARNING: Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

Make Vehicle	Model	Year
1968-1970 American Motors AMX	AMX	1968-1970
1958-1966 American Motors Ambassador	Ambassador	1958-1966
1965-1966 American Motors Classic	Classic	1965-1966
1970-1977 American Motors Hornet	Hornet	1970-1977
1969-1970 American Motors Javelin	Javelin	1969-1970
1965-1967 American Motors Marlin	Marlin	1965-1967
1967-1970 American Motors Rebel	Rebel	1967-1970

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ACT ? Advanced Clutch Technology | Clutch Kits & Flywheels Built to Handle Real Power

If you've added boost, tuned for more power, or simply want better throttle control, then your stock clutch won't cut it. That?s where ACT (Advanced Clutch Technology) comes in delivering high-performance clutch kits and flywheels designed for real drivers who push their builds on the street, strip, or track.

ACT?s lineup includes everything from daily driver friendly HD kits to hardcore twin disc setups for serious horsepower. Whether you?re launching hard in a WRX, drifting in a 370Z, or canyon carving in an M3, ACT gives you the torque capacity and engagement you need without sacrificing drivability.

Why ACT? Because Power Without Control Is Useless.

Hold More Power Engineered to handle turbo, supercharger, and high-compression builds
Faster Engagement Stronger pressure plates for better bite off the line
Better Pedal Feel Balanced response without going full race-car stiff
Reduced Rotational Mass Lightweight flywheels improve rev-matching and response
No Guesswork Direct-fit applications, no fabbing, no hassle

ACT Clutch Kits and Flywheels Fit the Cars Enthusiasts Build

ACT doesn?t just make universal performance parts ? they build complete, vehicle-specific clutch solutions for enthusiast favorites. Whether you daily a Civic Type R, track a Subaru STI, drift a 240SX, or drag a Mustang GT, ACT offers the right clutch to match your build goals.

Top supported platforms include the Nissan 350Z/370Z, Toyota Supra A90, Chevy Camaro SS/ZL1, Mitsubishi Evo, Ford Focus RS/ST, and BMW M3/M4 ? each with clutch options tuned to your driving needs.

What ACT Offers:

Performance Clutch Kits From HD street kits to twin-disc race systems
Clutch Discs 6-puck, full-face, rigid or sprung to match your style
Pressure Plates Heavy-duty options that increase clamp load without sacrificing control
Chromoly Lightweight Flywheels Quicker revs, smoother shifts, and less drivetrain stress
Complete Hardware Kits Everything you need for a proper install

Performance Tested. Driver Approved.

ACT isn?t hype ? it?s proven. Their clutches are SFI-certified, track-tested, and used by racers in drag, time attack, autocross, drift, and rally. But what really matters? They hold power, last longer, and feel right even after hundreds of hard launches or hours of canyon carving.

Whether you're upgrading for more power or replacing a tired OEM clutch, ACT gives you the bite, strength, and feel to drive harder with confidence. No compromises, no excuses just parts that work when it matters.

ACT warrants all products to be free of defects in materials and workmanship for normal use and service for a period of one (1) year from retail purchase. Written notice must be immediately given to ACT within the warranty period. We require a copy of the purchase receipt showing the unit was purchased from an Authorized Dealer or Advanced Clutch Technology directly to verify the product is under warranty. Products purchased used do not carry a warranty. This warranty is to the original purchaser and is non-transferable. All non-warranty items are subject to a $50 inspection bench test fee.

ACT reserves the right to examine any part returned for warranty claim to determine, to ACT's satisfaction, whether the material or workmanship of the part does not conform to this limited warranty. ACT's obligation under this warranty shall be limited to repairing, replacing, or crediting, at its option, any part which is deemed covered by ACT. No labor, lift or storage charges will be reimbursed for any reason. Damage to ACT's parts resulting from misuse, improper use, or abuse shall void this limited warranty. Failure to follow ACT's installation instructions and the vehicle manufacturers installation procedures and specifications shall void this limited warranty.

ACT undertakes no responsibility for the quality of the goods except as otherwise provided in this contract. ACT assumes no responsibility that the goods will be fit for any particular purpose for which you may be buying these goods, except as otherwise provided in the contract. ACT shall not be liable for any damage or injury to persons or property resulting from improper installation or misuse of any part subject to this warranty.