ACT Heavy Duty Pro Mass HD-O Street Sprung Clutch Kit

2005–2010 Jeep Grand Cherokee, 2007–2018 Jeep Wrangler, 2018–2026 Jeep Wrangler / Gladiator

JP6-HDSS

Overview:

The ACT Heavy Duty Pro Mass HD-O Street Sprung Clutch Kit is engineered to deliver exceptional performance and durability for a wide range of Jeep models, including Wrangler and Gladiator from 2007 through 2026, as well as select Grand Cherokee years. Designed for enthusiasts who demand smooth, precise clutch engagement combined with increased torque capacity, this kit excels in both spirited street driving and off-road conditions.

Featuring ACT’s renowned Heavy Duty pressure plate paired with their most popular street disc, the HD-O kit offers a balanced blend of toughness and drivability. Its quiet operation and smooth pedal feel make it an ideal upgrade for Jeep owners seeking enhanced clutch performance without sacrificing daily comfort.

Key Features:

This clutch kit incorporates advanced technology and premium materials to ensure reliable operation and extended service life:

• Heavy Duty pressure plate with ACT’s exclusive diaphragm design for increased clamp load and reduced deflection
• Four-stage heat-treated diaphragms for superior strength and longevity under high-stress conditions
• Precision pressure plate cover stampings for enhanced rigidity and consistent performance
• Precision-machined pressure plate castings optimized for heat absorption and durability
• Premium organic friction materials on steel-backed street discs for exceptional wear resistance and heat capacity
• Sprung center sections to reduce gear rattle and provide smooth, positive engagement
• Light to moderate pedal effort tailored for street and off-road use
• 100% clamp load tested and dynamically computer balanced for reliable high RPM operation
• Key areas induction hardened to extend component life
• Backed by ACT’s industry-leading one-year warranty

Construction & Design:

The HD-O Street Sprung Clutch Kit is meticulously engineered with high-quality materials and precision manufacturing processes. The diaphragm spring undergoes a rigorous four-stage heat treatment to enhance clamp load capacity and reduce spring fatigue, which translates to longer clutch life and consistent performance. The pressure plate cover is stamped with precision to maintain structural integrity and resist warping under extreme conditions.

The clutch disc features a robust steel-backed design combined with premium organic friction materials that provide excellent heat tolerance and fade resistance. The sprung hub center helps absorb drivetrain vibrations and reduces gear rattle, improving overall drivability and comfort during aggressive driving or off-road excursions.

Performance & Sound

Designed for street and moderate off-road use, the ACT HD-O clutch kit delivers smooth, positive engagement with minimal noise and vibration. The sprung disc reduces gear rattle commonly experienced in more aggressive clutch setups, maintaining a quiet and refined driving experience. Pedal effort remains light to moderate, ensuring comfortable operation without sacrificing performance or responsiveness.

Installation & Fitment:

This clutch kit is a direct replacement for factory units on compatible Jeep Wrangler, Gladiator, and Grand Cherokee models within the specified years. Installation requires standard clutch replacement procedures and does not typically necessitate modifications. It is recommended to have installation performed by a qualified technician to ensure proper alignment and optimal performance.

What's Included:

• Heavy Duty Pro Mass HD-O pressure plate
• Performance street sprung clutch disc with premium organic friction material
• High-quality release bearing and alignment tools (where applicable)
• Installation hardware

Ideal For:

This clutch kit is ideal for Jeep owners who demand a reliable, durable clutch capable of handling spirited street driving and moderate off-road use. It suits daily drivers looking for improved clutch feel and longevity, as well as enthusiasts upgrading from stock clutches for enhanced torque capacity and smoother engagement without excessive pedal effort.

ACT (Advanced Clutch Technology) engineers performance clutches and flywheels built for consistent engagement, higher torque capacity, and durability in street and race use. The brand emphasizes quality and reliability and is widely used by enthusiasts who need driveline components that can handle repeated hard launches, shifts, and track abuse.