McLeod RXT HD Twin GM LSA /LT4 1-1/8 x 26 Spline w/ 168T 8 Bolt Steel Flywheel
A supercharged LSA or LT4 with a pulley swap and tune will slip the factory twin disc long before it runs out of power. The McLeod 6406807HD is an RXT 1200 HD twin disc clutch with a steel 168 tooth flywheel for the GM 8-bolt crank LSA, LT1 and LT4 engines found in the 2009 to 2015 Cadillac CTS-V, the Camaro ZL1 and Camaro SS, and the C7 Corvette. McLeod rates the RXT 1200 for up to 1200 horsepower while keeping a pedal close to stock.
The RXT is McLeod's street twin. Two 9-11/16 inch ceramic discs ride on a 1-1/8 inch, 26 spline hub with a floater plate between them, all mounted to an adapter ring that bolts to the flywheel. Doubling the friction faces is how a clutch this size holds 1200 hp without needing a heavy pedal. The discs use a sprung hub, which softens engagement and helps protect the manual gearbox and axles on a hard launch.
This HD version is the modular assembly on a steel flywheel. Steel adds mass compared to an aluminum wheel, which makes the car easier to pull away from a stop and smoother on the street, while still being far lighter than the factory dual mass assembly. If you want the lighter, quicker-revving option, the RST twin on an aluminum flywheel covers the same engines.
Roll into full throttle in fourth or fifth at low rpm. If the tach climbs without matching acceleration, the clutch is slipping. Rule out the release side first, because a failing concentric slave cylinder or air in the line can keep the clutch partly applied and burn it quickly. If you are not after 1200 hp capability, the RST street twin with organic facing on the same steel flywheel is a softer choice for a mostly street car. Plan the full job with our manual versus automatic repair cost guide.
The kit is built for GM 8-bolt crank engines: the 2009 to 2015 LSA and the 2014 and later LT1 and LT4, with a 168 tooth ring gear and a 1-1/8 x 26 spline input. That covers the 2009 to 2015 Cadillac CTS-V manual, the 2012 to 2015 Camaro ZL1, later Camaro LT1 and LT4 manual cars, and the 2014 to 2019 C7 Corvette. Distributor catalogs do not all agree on the later Camaro and Corvette year ranges, and this kit does not fit 6-bolt LS engines. Send us the year and last 7 of the VIN before ordering if you are unsure. Browse more clutch kits in our rebuild kits department.
| Brand | McLeod Racing |
| Part number | 6406807HD |
| Fits | McLeod RXT HD Twin GM LSA /LT4 1-1/8 x 26 Spline w/ 168T 8 Bolt Steel Flywheel |
| Type | Clutch Kits - Multi |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
No. This kit is for the 8-bolt crank LSA, LT1 and LT4. The 2010 to 2015 LS3 Camaro SS uses a different crank and clutch package.
The distributor catalog data we checked lists the throwout bearing and pilot bushing as not included. Budget for a new release bearing or concentric slave cylinder and pilot bearing.
McLeod rates the RXT 1200 for up to 1200 horsepower while keeping street-friendly pedal effort.
This 6406807HD uses a steel flywheel, which is smoother pulling away and better for a street-driven car. McLeod's RST version with an aluminum flywheel revs more quickly and suits track use.
McLeod says to use normal street driving for about 1200 clutch cycles with traction control off, shifting up and down through the gears. Do not break it in on a chassis dyno.
McLeod's twin disc instructions call for 25 ft-lb in a star pattern, then 35 ft-lb in the same pattern, with no thread locker on the studs.
