ACT 2011 Ford Mustang HD/Perf Street Sprung Clutch Kit

ACT FM6-HDSS is the street clutch for a 3.7L V6 Mustang with a manual gearbox that has started to slip, chatter or wear out, or that now makes more power than the factory clutch was built for. Our listing is titled for the 2011 Mustang, and ACT's application data covers the 2011-2017 Mustang with the 3.7L V6. It combines ACT's Heavy Duty pressure plate with a full-face organic street disc, so it holds a lot more torque while still driving like a normal car.

What this clutch kit does in a 3.7L Mustang

With the pedal up, the diaphragm spring in the pressure plate clamps the disc between the plate and the flywheel, and the disc hub drives the six-speed's input shaft. A worn disc, or a factory clutch asked to hold the torque of a tune, intake and exhaust, lets the disc slide under load. ACT rates FM6-HDSS at 565 ft-lb measured at the crank, 32% over the factory clutch, using its F020 Heavy Duty pressure plate.

The disc is ACT's Performance Street sprung disc, part 3001011: 11 in (280 mm) organic facing with high copper content and a steel-backed lining, on a 1 in input spline. The sprung hub absorbs driveline shock, and ACT describes the feel as light to moderate pedal effort with smooth, positive engagement and OE to mild gear rattle. That makes it a good fit for a daily-driven V6 that sees the occasional autocross or drag strip pass.

Symptoms of a worn Mustang V6 clutch

• RPM rises in fourth, fifth or sixth at full throttle without the car accelerating harder
• The pedal engages higher and higher in its travel
• Shudder pulling away from a light, often from a glazed disc or hot-spotted flywheel
• A burnt clutch smell after a hard launch or stop-and-go hill driving
• Grinding into gears or a soft, sinking pedal, which more often points at the hydraulics than the disc

How to confirm the clutch is the problem

In fourth gear around 2,500 rpm, go to full throttle and watch the tach against the speedometer. If engine speed jumps ahead of road speed, the clutch is slipping. Then check the release side: the Mustang uses a hydraulic release system, and air in the line or a leaking slave can cause drag and hard shifting that feel like a bad gearbox. Our slipping diagnosis guide explains how true slip feels, and flare vs. slip helps separate clutch slip from other problems. For MT82 shift complaints specifically, see our Mustang MT82 problems page.

Fitment

Our listing says 2011 Ford Mustang. ACT lists FM6-HDSS for the 2011-2017 Mustang 3.7L V6 (Base, V6 and ST trims in its fitment table). It does not fit the 5.0L GT, the 2.3L EcoBoost or the 2005-2010 4.0L V6, which all use different clutch packages. If your car has an engine swap, an aftermarket flywheel or a different transmission, send us the year and VIN before ordering. More Mustang parts are on our Mustang parts page and in the rebuild kits collection.

Install notes

• The kit includes the F020 pressure plate, 3001011 disc, AT111EX alignment tool and PB1019 pilot bearing. There is no release bearing in the box.
• Replace or resurface the flywheel. ACT offers the 600670 XACT Streetlite flywheel as the companion part for this kit.
• Pull the old pilot bearing with a pilot bearing puller and fit the new PB1019 squarely.
• Center the disc, tighten the plate bolts evenly in a crossing pattern to factory torque, then bleed the clutch hydraulics with fresh DOT 3 brake fluid.
• ACT recommends 300-500 miles of mild, stop-and-go engagement on an organic disc before spirited driving. Expect pedal effort to rise; ACT says Heavy Duty plates typically add 15-40%.

Will FM6-HDSS fit my 2015 Mustang V6?

Yes, ACT lists it for the 2011-2017 Mustang with the 3.7L V6 and manual transmission. Our listing is titled 2011, so send us your VIN if you want a second check.

Does it fit a Mustang GT or EcoBoost?

No. The 5.0L GT and the 2.3L EcoBoost use different clutch packages. This kit is for the 3.7L V6 only.

How much power will it hold?

ACT rates it at 565 ft-lb of torque capacity measured at the crank, 32% over the factory clutch.

Is a throwout bearing included?

No. The kit contains the F020 Heavy Duty pressure plate, 3001011 organic disc, AT111EX alignment tool and PB1019 pilot bearing. Inspect the release bearing and slave while the transmission is out.

Do I need a new flywheel?

The disc needs a flat, clean friction surface, so the factory flywheel should be resurfaced or replaced. ACT pairs this kit with its 600670 XACT Streetlite flywheel.

• Transmission Slipping Diagnosis Guide
• Shift Flare vs. Slip: How to Tell the Difference
• Automatic vs. Manual Transmission Repair Cost