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Twin Disc Holding Power for Your GM LS Build
The McLeod RST HD Twin Disc Clutch Kit gives GM LS platform owners a serious upgrade path between McLeod's street focused RST line and the track ready RXT twin disc systems. Part number MLR6405507MD pairs organic and ceramic friction surfaces on opposing discs, giving 6-bolt LS applications strong holding power while keeping the pedal feel manageable for daily street use.
Key Features
- Hybrid friction combination with full-face organic on one disc and segmented ceramic on the other
- Rated to support up to 950 horsepower in a twin-disc configuration
- Includes a billet steel flywheel with 168-tooth ring gear for internal balance applications
- Built for a 1-1/8 inch, 26-spline transmission input shaft, MLR6405507MD is a direct fit for 6-bolt LS cranks
- Diaphragm-style pressure plate keeps clutch pedal effort reasonable for street driving
- Includes installation hardware and an alignment tool for a complete swap
Fitment Table
| Year Range | Make | Model |
|---|---|---|
| 1997-2015 | Chevrolet | GM LS Applications (6-Bolt Crank) |
| 1997-2015 | Cadillac | GM LS Applications (6-Bolt Crank) |
Specifications
| Detail | Value |
|---|---|
| MPN | MLR6405507MD |
| Brand | McLeod Racing |
| Horsepower Rating | 950 HP |
| Disc Diameter | 9.687 inches |
| Spline | 1-1/8 inch, 26 spline |
| Flywheel Material | Billet Steel, 168-Tooth |
| Disc Material | Organic / Ceramic |
| UPC | Not listed by manufacturer |
What's Included
- McLeod RST HD twin disc clutch assembly
- Billet steel flywheel, 168-tooth ring gear
- Installation hardware
- Alignment tool
About McLeod Racing
McLeod Racing has manufactured clutch and driveline components for street and race applications for decades, developing hybrid friction technology that balances holding power with everyday drivability. The RST HD line sits between their street oriented RST kits and the higher capacity RXT systems, aimed at high-horsepower LS builds that still see regular street use.
FAQ
What is the MLR6405507MD?The MLR6405507MD is a McLeod Racing RST HD twin disc clutch kit built for 1997 to 2015 GM LS engines with a 6-bolt crankshaft. It includes a billet steel flywheel and is rated to support up to 950 horsepower.
Does this kit include a flywheel?Yes, the MLR6405507MD comes with a dedicated billet steel flywheel featuring a 168-tooth ring gear for internal balance LS applications.
What horsepower can this clutch handle?This twin disc clutch kit is rated to support up to 950 horsepower thanks to its hybrid organic and ceramic friction disc combination.
Is this clutch good for daily driving?Yes, the RST HD line is designed to retain street-friendly pedal engagement through its full-face organic disc side while the ceramic side adds holding power for aggressive use.
What spline and crank pattern does this clutch use?The MLR6405507MD is built for a 1-1/8 inch, 26-spline input shaft and a 6-bolt LS crankshaft with a 168-tooth ring gear.
Are the throwout bearing and pilot bushing included?No, the throwout bearing and pilot bushing are not included with this kit and need to be sourced separately based on your specific transmission.
Does this clutch require anything extra for Cadillac CTS-V applications?Yes, 2004 to 2007 Cadillac CTS-V applications require a McLeod slave cylinder spacer, which is sold separately from this clutch kit.
What is the difference between the RST HD and McLeod's standard RST clutch?The RST HD uses a segmented ceramic disc on one side for additional holding power, while the standard RST relies on dual organic discs, making the HD version better suited to higher horsepower builds.
Install Instructions
- Support the vehicle and transmission safely, then remove the transmission per factory service procedures.
- Remove the factory flywheel and clutch assembly from the LS crankshaft.
- Install the included billet steel flywheel and torque the bolts to specification.
- Mount the twin disc clutch assembly, aligning both friction discs with the supplied alignment tool.
- Install the pressure plate and torque the cover bolts evenly in a star pattern.
- Install a compatible throwout bearing and pilot bushing, purchased separately if needed.
- Reinstall the transmission and reconnect the clutch linkage or hydraulic system.
- Complete a proper break-in period before subjecting the clutch to full load.
Prop 65 Warning
WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.
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