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ACT HD/Race Rigid 4 Pad Kit Toyota Corona Mark II 1971 - TK2-HDR4

If you're looking to step up your clutch game, the TK2-HDR4 ACT HD/Race Rigid 4 Pad Kit might just be what you need. This isn't your average clutch kit; it’s got ACT's Heavy Duty pressure plate, which is a fan favorite for a reason. The design is all about keeping things tight—more clamp load means less deflection, which translates to a longer-lasting clutch. They even put their diaphragms through a four-stage heat treatment, so you know they mean business.

Now, let's talk about the 4-pad rigid race discs. These bad boys are made from high-quality ceramic friction materials, so they're built to handle the heat. And that chrome-moly hub? Heat-treated for strength, so you can count on it. The lightweight design means you can shift quicker, which is a real plus when you’re pushing your ride to the limit. Just a heads up, though—the engagement is a bit harsher, but that’s what you want if you’re looking for speed.

When it comes to specs, this kit is no slouch. You’re looking at a clutch disc diameter of 7.9 inches (or 200 mm for the metric folks) and an input spline quantity of 21. The torque capacity is rated at 265 ft/lbs, which is a solid bump over stock. Just remember, this setup is really geared towards race use—so if you’re just cruising around town, you might want to think twice. But if you’re hitting the track, this kit will give you the responsiveness you crave.

Installation is straightforward, but make sure to check out the instructions:

Key Features:

  • Light to moderate pedal effort with aggressive engagement—just what you need for quick shifts.
  • Moderate friction life, but thanks to ACT's diaphragm design, you’ll get some extra mileage out of it.
  • Precision-engineered and balanced for reliability at high RPMs.
  • Not for daily drivers—this is race-focused gear.
  • Comes with grease and an alignment tool to make your install smoother.

Specifications:

  • Clutch Master Cylinder Included: No
  • Grease Included: Yes
  • Grade Type: Performance
  • Pilot Bushing Included: No
  • Pressure Plate Type: Heavy Duty
  • Release Bearing Included: Yes
  • Clutch Disc Diameter: 7.9 in (200 mm)
  • Disc Material: Ceramic
  • Input Spline Quantity: 21
  • Input Shaft Diameter: 0.9375 in
  • Alignment Tool Included: Yes
  • Disc Type Sprung Solid: Solid
  • Pressure Plate Bolts Included: No
  • Clutch Slave Cylinder Included: No
  • Flywheel Bolts Included: No
  • Pilot Bearing Included: Yes
  • Product Weight: 9.7 lbs
  • Torque Capacity: 265 ft/lbs
  • Torque Capacity Over OE: 0.86

Other Part Numbers:
ACT #actTK2-HDR4

Proposition 65

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

ACT Banner

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.

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