ACT Monoloc Collar – Subaru Models (inc. 2002+ WRX/STI) Mitsubishi Evo 2003-2015

ACT Monoloc Collar for Subaru WRX/STI and Mitsubishi Evo Models

The ACT Monoloc Collar for Subaru WRX/STI and Mitsubishi Evo models is a precision collar that locks the transmission input shaft to eliminate the shaft movement that can cause clutch noise and premature release bearing wear on these platforms. A known characteristic of the Subaru and Mitsubishi turbocharged drivetrain platforms is input shaft end play, the Monoloc collar addresses this directly.

DETAILS

• Eliminates transmission input shaft end play
• Reduces clutch noise from shaft movement
• Reduces premature release bearing wear
• Material: precision machined steel
• Fitment: 2002+ Subaru WRX/STI and 2003-2015 Mitsubishi Evo

Transmission input shaft end play is a design characteristic of the transmissions used in both the Subaru WRX/STI and Mitsubishi Evo platforms. When the shaft can move axially, the release bearing can make contact with the pressure plate diaphragm fingers intermittently, the source of the clutch noise and chatter that is common on these cars. The Monoloc collar takes up this end play.

The Monoloc collar is installed on the transmission input shaft and takes up the clearance that allows axial movement. It is a straightforward installation that can be done at the same time as a clutch service with the transmission already removed.

What’s in the Box

• ACT Monoloc collar
• Installation hardware

Why Choose ACT

Advanced Clutch Technology has been manufacturing performance clutch systems in the United States since 1993. Every ACT pressure plate uses a proprietary diaphragm design that increases clamp load and reduces deflection compared to OEM units, and every diaphragm goes through a four-stage heat-treating process before it leaves the factory. The result is a clutch system that holds more power than the stock unit, engages more precisely, and lasts longer under the kind of driving that wears factory clutches out quickly. ACT designs each application from scratch rather than modifying OEM tooling, which means the fitment is precise and the performance is intentional. Whether the build is a street-driven daily driver or a dedicated track car, ACT offers a kit at the correct specification for the use.

The RallySport Take

If your Subaru WRX/STI or Mitsubishi Evo has a clutch noise or chatter that you cannot diagnose, input shaft end play addressed by the Monoloc collar is a common culprit on these platforms. This is a well-regarded solution in the Subaru and Evo communities. Fits 2002+ Subaru WRX and STI and 2003-2015 Mitsubishi Evo 8/9/X as listed in the fitment table.

Fitment