McLeod Racing RST HD Twin Disc Clutch Kit w/ Aluminum Flywheel – GM LS 6-Bolt Crank | 1-1/8” x 26 Spline | 168T | 950HP Rated | 1997–2015

The McLeod RST HD Twin Disc Clutch Kit is engineered for GM LS-powered vehicles that need significantly more holding power than stock while retaining the street manners required for daily driving. Rated to 950 horsepower, the RST HD sits between McLeod’s RST and RXT twin-disc systems — delivering an ideal balance of torque capacity and drivability for high-horsepower LS builds across the C5/C6 Corvette, F-body Camaro/Firebird, GTO, G8, CTS-V, and 5th gen Camaro platforms. This kit includes a lightweight aluminum flywheel (168-tooth, 6-bolt) and is spec’d for the 1-1/8” x 26 spline input shaft used by the T56, TR6060, and most Tremec LS manual transmissions.

Fitment Specs – What to Verify Before Ordering

This kit is designed around three critical fitment parameters — verify all three match your application before ordering:

• 6-Bolt Crankshaft Flange: Fits GM LS engines with a 6-bolt crankshaft flange — standard on LS1, LS2, LS3, LS6, LS7, and most LS variants from 1997–2015. Not compatible with engines using a different bolt pattern. Verify your specific LS variant
• 1-1/8” x 26 Spline Input Shaft: Matches the input shaft specification of the GM T56, Tremec TR6060, and most Tremec LS manual transmissions. Verify your transmission’s input shaft diameter and spline count before ordering — some non-standard or aftermarket transmissions may use a different spec
• 168-Tooth Flywheel Ring Gear: 168T ring gear is the standard LS flywheel tooth count — compatible with the factory LS starter. Verify if running a non-stock or aftermarket starter

Common LS Applications (1997–2015)

• Chevrolet Camaro SS — LS1 (1998–2002), LS3 (2010–2015)
• Chevrolet Corvette C5 — LS1/LS6 (1997–2004)
• Chevrolet Corvette C6 — LS2/LS3/LS7 (2005–2013)
• Pontiac Firebird / Trans Am — LS1 (1998–2002)
• Pontiac GTO — LS2 (2004–2006)
• Pontiac G8 GXP — LS3 (2009)
• Cadillac CTS-V — LS6/LS2 (2004–2007)
• LS swap applications — verify all three fitment specs above

Hybrid Friction System – Organic + Ceramic

• Full-Face Organic Friction (one disc): Smooth, progressive engagement and excellent durability under repeated street and strip use — responsible for the RST HD’s street-friendly engagement feel and pedal modulation
• Segmented Ceramic Friction (opposing disc): Increased bite and enhanced holding power when performance demands rise — responsible for the RST HD’s elevated torque capacity over a single-disc or full-organic twin-disc setup

Key Features

• 950HP Rated – High-Horsepower LS Applications: Rated to 950 horsepower — suitable for supercharged, turbocharged, and naturally aspirated LS builds running well beyond stock power levels across all common LS variants
• Aluminum Flywheel Included – 168T, 6-Bolt: Lightweight aluminum flywheel reduces rotational inertia for faster throttle response, quicker rev-matching, and a more responsive, free-revving engine character — the preferred choice for track-focused and road racing LS builds where rev response is a priority over the thermal mass of a steel flywheel
• Twin Disc Design – Increased Torque Capacity Over Single Disc: Twin-disc design doubles the friction surface area — allowing significantly higher torque capacity without the extreme clamp loads that make single-disc high-capacity clutches difficult to drive on the street
• Street-Friendly Engagement: Despite its 950HP rating, the RST HD retains progressive engagement, manageable pedal effort, and drivability in traffic
• McLeod Racing Quality: Manufactured by McLeod Racing — a respected American clutch and drivetrain specialist with decades of experience in performance and racing clutch systems for GM LS and domestic V8 applications

Specifications

• Type: Twin Disc
• Friction: Hybrid — Full-Face Organic + Segmented Ceramic
• HP Rating: 950HP
• Flywheel: Aluminum, 168-Tooth, 6-Bolt Crank (Included)
• Input Shaft: 1-1/8” x 26 Spline
• Application: 1997–2015 GM LS (6-Bolt Crank)
• Part Number: 6305507MD
• UPC: 887753894083

⚠️ Installation Notes: Verify 6-bolt crank, 1-1/8” x 26 spline input shaft, and 168T starter compatibility before ordering. Professional installation by an experienced drivetrain specialist is strongly recommended. Clutch break-in procedure required — avoid aggressive launches or full-throttle acceleration for the first 500 miles. Transmission fluid and rear main seal inspection recommended during installation. McLeod Racing’s installation instructions must be followed — improper installation voids warranty.