McLeod Racing RST HD Twin w/ Aluminum Flywheel - 05-17 Mustang 4.6/5.0L - 1-1/8 x 26 Spline - 164T
The McLeod 6335807MD is for the 2005-2017 Mustang 4.6L or 5.0L owner who has put serious power through a swapped six-speed and wants the clutch to stop being the weak link. It pairs McLeod's RST HD twin disc with a dedicated billet aluminum flywheel, an 8-bolt crank pattern, a 164 tooth ring gear and discs splined 1-1/8 x 26. If you are searching for a twin that holds a supercharged S197 or a built Coyote without turning the car into a drag-only toy, this is one of the combinations to look at.
Two discs and a floater plate give the pressure plate four surfaces to clamp, so the kit gains holding capacity without needing a brutal diaphragm spring. Each RST HD disc is faced with full organic lining on one side and segmented ceramic pucks on the other. The organic face keeps engagement predictable in stop-and-go driving, while the ceramic face adds bite once the clutch is fully locked. McLeod slots the RST HD between its street RST and the competition RXT and rates it at up to 950 horsepower.
The aluminum flywheel is the difference between this kit and the steel version. Less rotating mass lets the engine rev up and drop rpm quicker between shifts, which suits road course and autocross cars and makes rev matching easier. The trade is that a light flywheel asks for a little more throttle when pulling away from a stop. The full kit ships at about 36.7 lb, roughly 8 lb lighter than the steel-flywheel version.
Do a low-rpm, top-gear, full-throttle roll-on. If the tach climbs while the speedometer lags, the clutch is slipping. Before blaming the disc, bleed the hydraulics, check the fluid level and make sure nothing is holding the release bearing against the fingers. Our slipping diagnosis guide walks through the checks, our clutch slipping symptoms page covers manual-specific causes, and the repair cost breakdown shows what the labor side of a clutch job runs.
McLeod lists 6335807MD for 2005-2017 Ford Mustang 4.6L and 5.0L engines with the 8-bolt crank flange, a 164 tooth ring gear and a 1-1/8 x 26 spline. Factory cars did not leave Ford with that input: the 2005-2010 GT used a Tremec TR-3650 and the 2011-up GT moved to the MT82. In practice this kit is for cars running an aftermarket gearbox with a 1-1/8 x 26 input shaft. A 2011-2017 GT or Boss 302 still on its MT82 needs the 1 x 23 spline RST HD aluminum kit. If you would rather have the heavier flywheel for a street and drag car, the steel flywheel RST HD 6435807MD covers the same application. Count your crank bolts, confirm your input spline, and send us year, VIN and transmission model if you are unsure. Other clutch and flywheel parts are in our hard parts section.
| Brand | McLeod Racing |
| Part number | 6335807MD |
| Fits | McLeod Racing RST HD Twin w/ Aluminum Flywheel - 05-17 Mustang 4.6/5.0L - 1-1/8 x 26 Spline - 164T |
| Vehicle fitment | Ford Mustang (2005-2017) |
| Type | Clutch Kits - Multi |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Not with the factory MT82. This kit is splined 1-1/8 x 26. A stock MT82 car needs the 1 x 23 spline RST HD aluminum kit, 6335825MD.
Aluminum revs and drops rpm faster and suits road course or autocross use. Steel adds inertia for easier launches in a heavy street and drag car. The clutch side is the same RST HD twin in both kits.
McLeod rates the RST HD twin disc at up to 950 horsepower.
No. McLeod describes the RST HD as having a lighter-than-stock pedal feel, because the twin disc design gets its holding power from extra friction surfaces rather than a stiffer spring.
The pilot bearing, the clutch fluid and, on a swapped gearbox, a release bearing set to the correct height for this twin. Look at the rear main seal while the flywheel is off.
