ACT 2015 Chevrolet Camaro HD/Perf Street Sprung Clutch Kit
ACT GM12-HDSS is a Heavy Duty pressure plate, Performance Street sprung organic disc and XACT Prolite flywheel kit for the fifth-generation Chevrolet Camaro SS with the 6.2L LS3 and six-speed manual. Our listing is titled for the 2015 Camaro, and ACT builds the same kit for the 2010-2015 SS, the 2014-2015 Z/28 and the 2006-2013 Corvette Z06. Buyers are usually chasing a factory clutch that slips after a tune, heads and cam or a blower, or a worn clutch and dual-mass flywheel that rattle and chatter.
Manual Camaro SS models use the Tremec TR-6060 six-speed. The clutch connects the LS3 to the transmission input shaft, and once the engine makes more torque than the stock clamp load can hold, the disc slips in the higher gears where load is greatest.
ACT rates this kit at 709 ft-lb at the crank, 42 percent over the original. The Heavy Duty pressure plate uses ACT's diaphragm design to raise clamp load and cut deflection, and every diaphragm goes through a four-stage heat treatment. The 280 mm (11 in) Performance Street disc uses organic friction material with high copper content for heat transfer, a steel-backed lining for burst strength and a sprung hub. ACT describes the feel as light to moderate pedal effort with smooth, positive engagement and OE to mild gear rattle, so it stays livable in traffic.
The kit contains the 600585 XACT Prolite flywheel, GM015 Heavy Duty pressure plate, 3000909 Performance Street sprung disc and ATGM026 alignment tool. ACT notes it must be used with the ACT flywheel in the kit or an LS flat flywheel.
Check the hydraulics first. Poor release, a soft pedal or grinding into gear usually means the clutch master, slave or line has a problem rather than the disc. Then do a high-gear pull from low rpm and see if engine speed outruns road speed. Our slipping diagnosis guide walks through it, and the flare vs slip guide explains what a true slip looks like on the tach.
ACT lists GM12-HDSS for the 2010-2015 Camaro SS 6.2L LS3, the 2014-2015 Camaro Z/28 7.0L LS7 and the 2006-2013 Corvette C6 Z06 7.0L LS7. The input shaft is 1.125 in. It does not fit the V6 Camaro, the supercharged ZL1 or automatic cars. The sixth-generation 2016-up Camaro is a different car and needs a different kit. If your car has been swapped or you are not sure which transmission it has, send us your year and VIN before ordering. Other clutch options are in our rebuild kits category; for 800-plus horsepower LS builds, look at the ACT Mod-Twin 10.5 XX kit instead.
| Brand | ACT |
| Part number | GM12-HDSS |
| Fits | ACT 2015 Chevrolet Camaro HD/Perf Street Sprung Clutch Kit |
| Vehicle fitment | Chevrolet Camaro Hd/Perf (2015) |
| Type | Clutch Kits - Single |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Yes. It includes the 600585 XACT Prolite flywheel, GM015 Heavy Duty pressure plate, 3000909 Performance Street sprung disc and ATGM026 alignment tool. ACT says to use the included flywheel or an LS flat flywheel.
ACT lists the kit for every 2010-2015 Camaro SS with the 6.2L LS3 and manual transmission, so yes, as long as the car still has its factory drivetrain. It does not fit the V6, ZL1 or 2016-up Camaro.
ACT rates GM12-HDSS at 709 ft-lb of torque measured at the crank, 42 percent more than the factory clutch.
No. The Camaro uses a concentric hydraulic slave cylinder with an integrated bearing. Inspect it while the transmission is out and replace it if it is leaking or worn.
ACT describes the Heavy Duty pressure plate as light to moderate pedal effort with smooth engagement, so it is suited to daily driving.
ACT recommends 300-500 miles of easy driving for organic street discs before hard launches.
