McLeod RST Clutch Mustang 1-1/16in X 10 Spline For 157 Tooth Flywheel Only
The McLeod 6913-03 is an RST twin-disc clutch for small-block Ford Mustang builds that keep a 157-tooth flywheel and a Ford-style 1-1/16 in. x 10 spline input shaft. It is the clutch people look for when a built 5.0 or stroker has outgrown a single-disc kit: the car pulls fine to the top of second, then the tach jumps in third, or a heavy-duty single-disc plate has made the left leg the weak link in traffic. McLeod's listing calls it the RST twin for small flywheels, black ring, with two organic discs of about 9.687 in. diameter.
A 157-tooth flywheel is a small-diameter wheel, so there is only so much disc you can fit on it. McLeod gets around that by stacking two discs with a floater plate between them on a black adapter ring that bolts to the flywheel's pressure plate pattern. Four friction faces share the load, so the pressure plate does not need a crushing spring to hold more torque, and McLeod builds the RST for a pedal lighter than stock. The RST is the all-organic member of the family, which keeps engagement smooth enough for a daily-driven street car, and McLeod rates the RST line for about 800 horsepower. It is not intended as a competition clutch.
Rule out the release side first. On a hydraulic conversion, bleed the system and check the slave or hydraulic bearing for leaks; on a cable car, check the cable and quadrant adjustment, because a bearing that rides the fingers will make any clutch slip. Look at the bottom of the bellhousing for oil from the rear main seal or the transmission front seal, since oil will glaze new discs too. Our slipping diagnosis guide walks through separating true clutch slip from other drivetrain faults, and shift flare vs. slip explains what the tach is telling you.
This is a ring version: no flywheel, and no year range on the listing. It fits when both of these are true. Your flywheel has 157 teeth on the ring gear, the small Ford pattern that McLeod's black ring is made for. Your gearbox input shaft is 1-1/16 in. x 10 spline. Count the flywheel teeth and the input splines before ordering, because McLeod builds the same clutch in other splines and ring sizes and they do not interchange.
Engine balance stays with your flywheel, so keep the flywheel that matches your crank. If you are unsure, send us your engine, flywheel tooth count, transmission and release type and we will check it before it ships.
| Brand | McLeod Racing |
| Part number | 6913-03 |
| Fits | McLeod RST Clutch Mustang 1-1/16in X 10 Spline For 157 Tooth Flywheel Only |
| Type | Clutch Kits - Multi |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
No. The 6913-03 uses McLeod's small black ring for a 157-tooth Ford flywheel. A 164-tooth Ford flywheel is a large-diameter pattern that needs a red-ring McLeod unit.
No. This is the adapter ring version that bolts to your own 157-tooth flywheel. Resurface the flywheel and keep the one that matches your engine's balance.
McLeod lists a separate 6913-03C version for cable linkage. Tell us whether your car is cable or hydraulic release and we will confirm the right part number.
McLeod rates the all-organic RST twin-disc line for about 800 horsepower in street-driven cars. For more power or track use, McLeod steps up to the RST HD and ceramic RXT series.
This unit uses 1-1/16 in. x 10 spline discs. Count the splines on your input shaft; a 26-spline or 23-spline shaft needs a different McLeod part number.
McLeod says not to break it in on a chassis dyno. Drive normally on the street for about 1,200 clutch cycles with traction control off, then it is ready for hard use.
