McLeod RST Twin Power Pack 11-17 Ford Mustang 5.0L Coyote Clutch Kit

The McLeod 6435825 RST Twin Power Pack is the street-focused twin disc for a 2011-2017 Mustang GT or Boss 302 with the 5.0L Coyote and the factory 1 x 23 spline gearbox. It comes as one part number with the clutch and a dedicated billet steel flywheel, set up for the 8-bolt crank, zero balance and a 164 tooth ring gear. It is the right search result for an owner who has added a supercharger or bolt-ons, wants a clutch that holds, and has no plans to race the car.

What the RST twin does in a 5.0 Mustang

McLeod's RST is its entry twin disc. Two organic-lined discs share the clamp load from one pressure plate, which doubles the friction area and lets the kit hold power with a soft pedal. McLeod rates the RST at up to 800 horsepower. Both discs are full organic, so take-up feels close to a stock clutch, which matters in traffic and on the daily drive.

McLeod is clear that the RST is a street-only clutch and is not intended for competition. If the car sees drag launches, road course days or a big power level, step up to the RST HD 6435825MD, which adds ceramic facings and a 950 hp rating, or the RXT Twin Power Pack for competition use.

The billet steel flywheel adds inertia that makes pulling away smooth in a heavy car. The complete Power Pack ships at roughly 44 lb.

Symptoms this kit solves

• Stock clutch slipping in the upper gears after a supercharger, tune or cam
• Rpm rising faster than road speed under full throttle
• Chatter or shudder from a heat-damaged factory disc
• Pedal engagement creeping higher as the disc wears
• Burnt smell after a spirited drive

How to diagnose it first

Hold the car in fourth or fifth at low rpm and go to full throttle. A clutch that slips lets the tach jump without the car pulling harder. Rule out low fluid or air in the line, because the hydraulic system can keep the bearing loaded against the fingers. Our slipping diagnosis guide lays out the test, and the repair cost guide helps you budget the labor. If the complaint is notchy shifts rather than slip, read the MT82 problems guide first.

Fitment

McLeod lists 6435825 for the 2011-2017 Ford Mustang GT and Boss 302 with the 5.0L, 8-bolt crank, 0 balance, a 164 tooth ring gear and a 1 x 23 metric spline, the spline used on the factory MT82. Cars that have been swapped to a 1-1/8 x 26 input gearbox need a different McLeod part number. If your car has been modified in any way, send us year, VIN and transmission before ordering so we can confirm the match. More clutch and flywheel options are in our hard parts section.

Install notes

• Replace the concentric slave and release bearing while the gearbox is out; the Exedy BRG0186 fits 2011-2015 GT cars.
• Install a new pilot bearing and use the flywheel bolts and dowel pins called for by McLeod.
• Check that both discs slide on the input splines by hand, and assemble them in the marked order.
• Torque the pressure plate nuts in two cross-pattern passes, 25 ft-lb and then 35 ft-lb, with no thread locker.
• Bleed with fresh DOT 3 or DOT 4 fluid, following our hydraulic clutch bleeding guide, then break the clutch in gently.

Does 6435825 fit a stock 2011-2017 Mustang GT?

Yes. It is splined 1 x 23 metric for the factory MT82 and fits the 8-bolt Coyote crank with a 164 tooth ring gear.

Can I use this clutch at the drag strip?

McLeod says the RST is for street use only and not intended for competition. For launches and track days, choose the RST HD or RXT.

How much power does the RST twin hold?

McLeod rates the RST twin disc at up to 800 horsepower.

Is the flywheel included?

Yes. This Power Pack includes a dedicated billet steel flywheel with the clutch under one part number.

What else should I replace?

The concentric slave and release bearing, the pilot bearing and the clutch fluid. Inspect the rear main seal while the flywheel is off.

• Transmission Slipping Diagnosis Guide
• Automatic vs Manual Transmission Repair Cost