McLeod RXT Twin Power Pack 11-17 Ford Mustang 5.0L Coyote Clutch Kit w/ Steel Flywheel

Plenty of boosted 2011-2017 Coyote Mustangs are daily drivers first, and that is where a steel flywheel makes sense. McLeod RXT Power Pack 6435825M pairs the RXT twin disc with ceramic facings to a billet steel flywheel made from A36 steel with a heat-treated ring gear, cut for the 8-bolt 5.0L crank with 164 teeth, zero balance and a 1 x 23 metric spline for the factory MT82. You get twin disc holding power with more flywheel mass for smoother pulls from a stop and in traffic.

Why a steel flywheel twin disc in a 5.0L Mustang

The RXT twin divides clamp load across two discs and a floater, so it holds what a supercharged or turbo Coyote makes, rated by McLeod at about 1,000 to 1,100 horsepower, without a heavy pedal. The difference in this version is the flywheel. At a listed shipping weight of about 45 lb against roughly 38 lb for the aluminum flywheel kit, the steel unit stores more energy. That helps the car pull away cleanly in first, makes stop and go traffic easier and is more forgiving with tall gears or a heavy car. McLeod states the steel flywheel is designed specifically for its RST, RXT and RXT 1200 assemblies.

Symptoms this kit addresses

• Factory clutch slipping in the upper gears after a tune, blower or turbo.
• Shudder pulling away from a light, often from a glazed disc or hot spots on the flywheel face.
• A heavy aftermarket single disc that wears out your leg in traffic.
• Grinding into gear from a clutch that does not fully release; check the slave and fluid first.
• Release bearing noise with the pedal down, which means the slave assembly is due.

How to confirm the clutch is slipping

In fourth gear around 2,500 rpm, roll into full throttle. If engine speed rises faster than road speed, the clutch is not holding. Check for oil from the rear main seal before you order. If shifts are notchy rather than slipping, the gearbox may be the issue; our MT82 problems guide covers that, and the manual transmission repair cost guide explains what the job costs at a shop.

Fitment

Listed for the 2011-2017 Ford Mustang with the 5.0L Coyote V8, including the Boss 302 per McLeod's application line, and the factory MT82 six-speed with the 1 x 23 metric input. It does not fit V6 or EcoBoost cars, 2018-up cars, the GT350 or GT500, or any car swapped to a 26 spline transmission. If you have changed the gearbox or are unsure of the input, send us the year and VIN before ordering. Prefer lower weight for a track car? The aluminum flywheel RXT 6335825M is the same clutch, and the organic-faced RST HD twin with steel flywheel is an option for a softer engagement.

Install notes

• Check that each disc slides freely on the input shaft; clean the spline and use dry graphite only if needed.
• Bottom disc goes in with the flywheel side label forward. Bolt the adapter ring with floater down using the supplied bolts and no added washers.
• Keep the drive straps and alignment marks lined up, then torque the six pressure plate nuts to 25 ft-lb and then 35 ft-lb in a star pattern. No thread locker.
• Replace the factory slave and release bearing; on 2011-2015 cars the Exedy slave cylinder and release bearing fits. Bleed the line afterward following our hydraulic clutch bleeding guide.
• Replace a rough pilot bearing with a pilot bushing remover.
• Break in with about 1200 normal engagements with traction control off before any hard launches, and not on a dyno.

Why choose the steel flywheel over aluminum?

Steel adds flywheel mass, which makes pulling away from a stop smoother and is easier to live with in traffic. Aluminum saves weight and revs faster, which suits track use. The clutch assembly is the same RXT twin.

Does it fit the Boss 302?

McLeod's application line for this kit names the 2011-2017 Mustang GT and Boss 302 5.0L with the 1 x 23 metric spline gearbox.

What should I replace at the same time?

Replace the hydraulic slave and release bearing, the pilot bearing and the clutch fluid. McLeod recommends replacing the factory slave because the labor is the same.

Will it work with a T-56 Magnum or TKX swap?

Not with this hub. Those gearboxes use a 26 spline input. Ask us for the 26 spline version of the RXT for your swap.

Is there gear rattle after install?

Some idle rattle is normal once the factory flywheel is replaced with a solid billet flywheel. The steel flywheel usually rattles less than aluminum, but it is gearbox noise, not a defect.

• Automatic vs Manual Transmission Repair Cost