McLeod Racing RST HD Twin w/ Aluminum Flywheel - 09-15 Cadillac CTSV - 14-19 C7 Corvette...

Owners of a 2009-2015 Cadillac CTS-V with the six-speed manual usually come looking for a new clutch after a pulley and tune, when the car starts to slip in third and fourth or the factory clutch and dual-mass flywheel are worn out. The McLeod 6306807MD is the RST HD twin disc on a dedicated aluminum flywheel for GM's 8-bolt LSA-family engines, rated by McLeod for up to 950 horsepower and meant for a car that is driven on the street most days and on track some weekends.

What the RST HD twin does in a CTS-V

The second-generation CTS-V's supercharged 6.2L LSA was rated 556 horsepower and 551 lb-ft, and the manual cars used a Tremec TR-6060 with a factory twin-disk clutch and dual-mass flywheel. The RST HD keeps the twin disc idea but changes the friction. McLeod pairs full-face organic material on one side with segmented ceramic on the other, so engagement stays smooth like an organic street clutch while the ceramic side adds bite once torque climbs. McLeod positions it between its RST and RXT twins and describes a lighter-than-stock pedal.

The aluminum flywheel replaces the heavy dual-mass unit with a light single-mass one. The engine revs and drops faster between shifts, which helps on a road course. Expect to use a little more throttle pulling away from a stop, and some extra gear rattle at idle compared with the dual-mass setup.

Symptoms that bring CTS-V owners here

• Slip at full boost in the middle gears after a pulley, tune or E85
• A clutch that holds cold but slips once heat soaked on track
• Rattle, clunk or vibration from a worn dual-mass flywheel
• Burnt smell or a high, vague engagement point
• Hard shifts or grinding that turn out to be a release problem

How to confirm before buying

Check the hydraulics first: fluid condition, a leaking concentric slave, and full pedal return. A failing slave can feel like a worn clutch. Then load the car in a high gear at low rpm and add boost; if engine speed climbs while road speed does not, it is slipping. A datalog makes this clear. Our slipping diagnosis guide covers the process, and the rebuild vs replace guide helps if the TR-6060 has its own problems while it is out.

Fitment

This listing is titled for the 2009-2015 Cadillac CTS-V and the 2014-2019 C7 Corvette LT1/LT4, and our vehicle data lists it for the 2009-2015 CTS-V. McLeod's own application line for this part number reads 2009-2015 CTS-V, 2016-2024 Camaro LT1 and 2012-2024 Camaro ZL1, and it does not name the Corvette. The C7 used a Tremec TR-6070 seven-speed manual, so C7 owners should send us the year and VIN and wait for our fitment confirmation before ordering. CTS-V and Camaro owners should confirm a manual car with the 8-bolt crank and a 1-1/8 x 26 input. Automatic cars are not covered.

Need something different? The organic RST twin on the same aluminum flywheel is the softer street choice, and the RXT HD on a steel flywheel is the move for much higher power.

Install notes

• Inspect and replace the pilot bearing as needed; a pilot bushing remover helps.
• Bottom disc first, flywheel side toward the flywheel, centered on the alignment tool.
• Strap alignment and the ring-to-cover alignment marks must match. No added washers, no Loctite.
• Pressure plate nuts 25 ft-lb then 35 ft-lb in a star pattern; check finger height with a straightedge.
• Replace a tired concentric slave while you are in there and bleed with fresh fluid.
• Street break-in for about 1,200 shifts with traction control off; no dyno break-in.
• More power also loads the rear axles. For 2009-2010 cars see the DSS Level 5 CTS-V axle.

Does this fit a C7 Corvette?

The listing title names the 2014-2019 C7 LT1/LT4, but McLeod's application line for 6306807MD lists the CTS-V and LT1/ZL1 Camaros and not the Corvette. Send us your year and VIN and we will confirm before you order.

What is the difference between the RST, RST HD and RXT?

The RST uses organic discs for a soft street feel. The RST HD pairs organic with segmented ceramic for more holding power, rated up to 950 horsepower. The RXT uses ceramic discs for higher power levels.

Will my CTS-V be louder with the aluminum flywheel?

A single-mass aluminum flywheel usually brings more gear rattle at idle than the factory dual-mass unit, and it takes a bit more throttle to pull away. In exchange the engine revs more freely.

Should I replace the slave cylinder?

It is a good idea. A leaking or tired concentric slave is a common reason for poor release, and replacing it while the transmission is out avoids pulling it again.

How do I break the clutch in?

Drive normally on the street for about 1,200 clutch cycles with traction control off. McLeod says not to break it in on a chassis dyno.

• Transmission Slipping Diagnosis Guide
• Rebuild vs Replace vs Reman Transmission
• Shift Flare vs Slip: How to Tell the Difference