McLeod RST Clutch Kit Chevy Small/Big Block 1-1/8in X 26 Spline 9.688in Diameter Disc

The McLeod 6911-07 is the all-organic RST twin-disc clutch on McLeod's large red adapter ring, set up for Chevy small-block and big-block builds that run a large-diameter flywheel and a 1-1/8 in. x 26 spline input shaft. It is the usual answer for a street-driven Chevy that has outgrown a single-disc clutch: it slips when the power comes in on the top of a gear, it chatters away from lights, or the pressure plate added to stop the slipping has a pedal you dread in traffic. McLeod's listing describes two organic discs of about 9.687 in. diameter for use with a large-diameter flywheel only.

What the RST twin-disc clutch does

Two smaller discs and a floater plate replace one big disc. The red adapter ring bolts to the flywheel's pressure plate pattern and carries the floater and pressure plate on studs, so four friction surfaces share the clamping load. That lets McLeod hold far more torque than a single disc of the same size while keeping the pedal lighter than stock and the rotating assembly light. The RST uses organic facings on both discs, which gives the smoothest engagement in McLeod's twin-disc range, and McLeod rates the RST for about 800 horsepower in street cars. It is the street member of the family, not a competition clutch.

Symptoms that point to an upgrade like this

• RPM flaring with no gain in road speed during a full-throttle pull in the upper gears.
• Judder on takeoff, especially after the old disc was overheated.
• A hot, burnt-friction smell after launches, towing a trailer or a long climb.
• Heavy pedal effort from a high-clamp single-disc pressure plate.
• Gear clash going into first or reverse because the clutch drags instead of releasing fully.

How to confirm before buying

Make sure the clutch is really at fault. Bleed the hydraulics or adjust the mechanical linkage, check the release bearing and slave for leaks, and look for oil from the rear main seal on the bellhousing floor. A clutch that only slips when hot points to worn or glazed friction; one that slips from the first pull after a new install often points to linkage preload or oil contamination. Our transmission slipping diagnosis guide covers how to tell clutch slip from other drivetrain faults, and the manual vs automatic repair cost guide helps you budget the full clutch job.

Fitment: large-diameter flywheel, 26-spline input

This listing is the ring version only. It does not include a flywheel and does not carry a vehicle year range, so match it by hardware. Your flywheel must be a large-diameter design: for Chevy, that is the 168-tooth flywheel. McLeod's red ring also covers Chrysler 143T and 172T, Ford 164T, 176T, 180T and 184T, and Buick, Olds and Pontiac 160T and 166T flywheels. Your input shaft must be 1-1/8 in. x 26 spline. Count both before ordering.

• Chevy 153-tooth flywheel: small-diameter, so you need the black-ring McLeod RST 6913-07 in the same spline.
• Late-model LS-X 168T or Ford modular 164T flywheels use McLeod's gold metric ring, not the red ring.
• Want more grip on the same red ring: the RST HD 6911-07MD adds ceramic faces for up to 950 hp, and the ceramic RXT 6921-07 is built for track cars.

If you are not sure, send us the engine, flywheel tooth count and transmission and we will confirm the match.

Install notes

• Find and fix the cause of the old clutch failure first, especially oil leaks, or the new discs will glaze.
• Surface the flywheel, clean it dry, install any dowel pins it requires, and replace a damaged pilot bearing. A puller such as the OTC 7318 flywheel pilot bearing puller gets the old one out without damaging the crank bore.
• Hand-fit both discs on the input shaft; they must slide freely on the splines.
• Install the bottom disc flywheel-side forward on the supplied alignment tool. Bolt the red ring down with the supplied bolts and no added washers: 25 ft-lb for 8 mm bolts, 35 ft-lb for 10 mm and 3/8 in.
• Keep the drive straps stacked and the alignment marks matched, then run the six nuts to 25 and then 35 ft-lb in a star pattern with no thread locker, and check that the diaphragm fingers sit at or below the back of the cover.
• Balance on the flywheel only, never the ring. Break in over about 1,200 normal street shifts. A spare clutch alignment tool kit is useful if you service other cars too.

Will the 6911-07 fit my 153-tooth Chevy flywheel?

No. A 153-tooth Chevy flywheel is small-diameter and needs McLeod's black-ring unit. The 6911-07 red ring is for large-diameter flywheels such as the Chevy 168-tooth.

Is a flywheel included?

No. This kit bolts to your existing large-diameter flywheel. Have it resurfaced and keep the flywheel that matches your engine's balance.

Can I use it on an LS engine?

Not usually. Late-model LS-X 168-tooth flywheels use McLeod's gold metric ring, sold under 6912-series part numbers. Confirm your flywheel before ordering.

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

The RST uses organic facings on both discs and is rated for about 800 hp. The RST HD adds a segmented ceramic face on each disc and is rated up to 950 hp, with slightly firmer engagement.

What spline count does my gearbox need?

This unit uses 1-1/8 in. x 26 spline discs. A 10-spline or 23-spline input shaft needs a different McLeod part number.

Should I replace the release bearing?

McLeod's installation checklist says to replace a worn throwout bearing during the job. Match the new bearing to your transmission and hydraulic or mechanical release.

• Transmission Slipping Diagnosis Guide
• Automatic vs. Manual Transmission Repair Cost: What to Actually Expect
• Rebuild vs Replace vs Reman Transmission