Next Level Performance
August 20, 2026 • 9 min read
Our Verdict
The McLeod RXT 1200 twin-disc is the clutch to run when your manual HEMI Challenger has outgrown its stock disc.
Rated to hold 1,200 crank horsepower on twin ceramic discs, the RXT 1200 turns a 707-hp Hellcat, a boosted Scat Pack, or a nitrous R/T into a car that hooks instead of slips – while a sprung hub keeps street driving civil. If you make under 800 hp and stay off the track, McLeod's RST twin saves you money; everyone chasing big power should reach for the RXT 1200.
Shop Our Top Pick →The McLeod RXT 1200 twin-disc clutch is a 1,200-horsepower street/strip clutch kit built for the manual, Tremec TR-6060 six-speed Dodge Challenger – the R/T, SRT8, 392 Scat Pack, and supercharged SRT Hellcat. If you have added a pulley, a tune, nitrous, or a bigger blower and your factory clutch now smells like a campfire on the second gear pull, this is the upgrade that fixes it. At NLP Performance in Tampa, FL, the manual HEMI cars we see most often share one complaint: the stock clutch cannot hold the torque these engines make once the modifications start. Here is a full breakdown of the McLeod RXT 1200, how it stacks up against McLeod's cheaper RST and RXT twins, and exactly which Challengers it bolts into.
Why the Manual HEMI Challenger Needs a Clutch Upgrade
The factory clutch is the weakest link in the manual Challenger's driveline once you add power. The 5.7L R/T makes 372–375 hp and about 470 lb-ft, the 6.4L SRT8 and 392 Scat Pack make 470–485 hp and roughly 475 lb-ft, and the supercharged 6.2L SRT Hellcat makes 707 hp and 650 lb-ft – all sent through a single Tremec TR-6060 six-speed. The R/T and Scat Pack ship with a single organic disc that is comfortable but starts slipping when a tune and bolt-ons push torque past roughly 500 lb-ft.
The Hellcat is a different story. It leaves the factory with a ZF-Sachs 258mm twin-disc rated around 650 lb-ft, which is barely enough headroom for a stock car. Add the single most common Hellcat mod – a smaller supercharger pulley and a tune, worth 75–120 wheel horsepower – and that clutch is now living on the edge. Hellcat owners routinely report premature clutch wear and release-bearing failure even at stock power, so the moment you modify one, a clutch upgrade stops being optional. That is where a twin-disc like the McLeod RXT 1200 earns its keep: it roughly doubles the friction surface versus a single disc, so it holds far more torque without demanding a brutal, leg-day pedal.
McLeod's modular twin-disc design stacks two friction discs to hold big HEMI torque.
McLeod RXT 1200 Twin-Disc Clutch: Review & Specs
The McLeod RXT 1200 is a twin-disc clutch kit rated to hold 1,200 crank horsepower using two ceramic-lined friction discs measuring 9.687 inches, spinning on a 1-1/8-inch 26-spline sprung hub. It is the top of McLeod's street/strip twin-disc ladder for the HEMI Challenger, and the same modular assembly that fits the 10–14 Shelby GT500 and the manual Dodge Viper. "Street/strip" is the key phrase: the ceramic discs and sprung-hub design let it drive to the track, run a stack of quarter-mile passes, and drive home without hammering your left leg the way a puck-style race clutch would.
Key Specifications
What makes the RXT 1200 our top pick for a modified manual Challenger is the balance. On a 700-plus-horsepower Hellcat, a single-disc that can hold that torque usually needs a rock-hard pedal and grabs like a light switch in traffic. The twin ceramic discs spread the clamping load, so engagement stays progressive and the pedal effort stays moderate. The modular design is a practical bonus too: the discs and floater plate can be serviced without pulling the entire assembly, which matters when a clutch lives at the drag strip.
What We Like
- + 1,200-hp capacity leaves huge headroom for a boosted or nitrous HEMI
- + Twin ceramic discs hold big torque with only moderate pedal effort
- + Sprung hub keeps daily driving smooth and quiet
- + Modular assembly is serviceable without a full teardown
Things to Consider
- – Overkill (and pricier) if you make under 800 hp – the RST twin is enough
- – Ceramic twin-disc engagement is more abrupt than a soft OEM single disc
How the RXT 1200 Compares to McLeod's RST and RXT Twins
McLeod builds three twin-disc clutches for the manual HEMI Challenger, and they are separated almost entirely by holding capacity and disc material. The RST is an organic-lined twin rated to 800 hp for street-only cars, the RXT steps up to ceramic discs and 1,000 hp, and the RXT 1200 tops the range at 1,200 hp for street/strip duty. All three use the same modular sprung-hub layout, so drivability is similar – you are really buying headroom. Match the clutch to your crank horsepower with a little margin and you will not overpay for capacity you never use.
| Kit | Capacity | Disc Material | Best For | Price |
|---|---|---|---|---|
| McLeod RXT 1200 TwinTop Pick | 1,200 HP | Ceramic | Boosted / nitrous street & strip | $1,795.00 |
| McLeod RXT Street Twin | 1,000 HP | Ceramic | Big-power street cars | $1,595.00 |
| McLeod RST Twin | 800 HP | Organic | Bolt-on street builds | $1,495.00 |
Do You Need the McLeod Aluminum Flywheel?
A lightweight aluminum flywheel is optional with a twin-disc clutch, but it is a worthwhile companion on a serious HEMI build. McLeod's aluminum flywheel for the 5.7L and 6.4L Challenger uses a 130-tooth ring gear and shaves rotating mass versus the heavy factory steel unit, which lets the engine rev up and settle faster for quicker shifts and better throttle response. McLeod's modular twin-disc kits already ship with a steel base plate, so you do not have to run this flywheel – think of it as the finishing piece for a track-focused car where every bit of rotating weight matters.
An aluminum flywheel trims rotating mass for quicker revs on a HEMI build.
Fitment: Which Manual Challengers Does It Fit?
The McLeod RXT 1200 (part 6975-07HD) fits 2008–2018 Dodge Challenger models equipped with the six-speed Tremec TR-6060 manual transmission – that includes the R/T (5.7L), SRT8 and 392 (6.4L), Scat Pack (6.4L), and the SRT Hellcat (6.2L supercharged). Because it uses a shared modular assembly, the exact same kit also covers the 2013–2017 SRT Viper and the 2010–2014 Ford Mustang Shelby GT500. It is a manual-transmission part only: automatic Challengers use a torque converter and have no clutch to replace. Always confirm your car is a factory six-speed before ordering, and if you are unsure, our Tampa team can verify fitment by VIN.
The complete McLeod twin-disc kit ships with discs, floater, cover and base plate.
Installation & What to Expect
Installing a twin-disc clutch on a manual Challenger is a transmission-out job that most shops complete in five to eight hours. Because the RXT 1200 arrives as a pre-set modular assembly, there is no clutch alignment tool fumbling – you bolt the base plate to the crank, torque the cover, and drop the transmission back in. While you are in there, it is smart to replace the release (throwout) bearing and inspect the slave cylinder, since the factory release bearing is a known Hellcat weak point that fails alongside worn clutches.
A splined alignment tool ships with the kit to line up the discs on install.
Expect a firmer, more defined pedal than stock, but nothing that will wear out your leg in traffic thanks to the sprung-hub, ceramic-disc design. Give the clutch a proper break-in – roughly 300–500 miles of gentle street driving before any hard launches – so the discs bed in evenly. Do that, and a well-installed RXT 1200 will hold a big-boost HEMI launch after launch without the fade, chatter, or slip that finally killed your stock clutch.
Frequently Asked Questions
How much horsepower can the McLeod RXT 1200 hold?
The McLeod RXT 1200 is rated to hold 1,200 crank horsepower using two ceramic-lined friction discs. That gives a 707-hp manual Hellcat roughly 500 hp of headroom, so it comfortably supports pulley-and-tune, nitrous, and bigger-blower builds without slipping.
Does the RXT 1200 clutch fit a Challenger Hellcat?
Yes. The RXT 1200 (part 6975-07HD) fits the six-speed manual SRT Hellcat along with the R/T, SRT8, 392, and Scat Pack from 2008–2018, all of which share the Tremec TR-6060 transmission. It does not fit automatic Hellcats, which use a torque converter instead of a clutch.
RXT 1200 vs RST vs RXT: which McLeod twin should I buy?
Match the clutch to your power. The RST twin holds 800 hp on organic discs for street-only bolt-on cars, the RXT holds 1,000 hp on ceramic discs for big-power street builds, and the RXT 1200 holds 1,200 hp for boosted or nitrous street/strip cars. Buy the one that covers your crank horsepower with a small margin.
Is a twin-disc clutch hard to drive on the street?
No. McLeod's twin-disc clutches use a sprung hub and ceramic discs that keep engagement progressive and pedal effort moderate. Two discs share the clamping load, so the RXT 1200 holds far more torque than a single disc without the harsh, on-off feel of a race puck clutch.
Why does the stock manual Challenger clutch slip after mods?
The factory clutch is sized for stock torque. A tuned 5.7L or 6.4L pushing past roughly 500 lb-ft overwhelms the single organic disc, and even the Hellcat's ZF-Sachs 258mm twin-disc, rated near 650 lb-ft, runs out of clamping force once you add a pulley and tune. A higher-capacity clutch restores the grip.
Should I replace the flywheel and release bearing with the clutch?
Replace the release bearing every time – it is a known Hellcat failure point and cheap insurance with the transmission already out. A lightweight aluminum flywheel is optional; it quickens throttle response but is not required, since McLeod's modular twin-disc kits include their own steel base plate.
Ready to Stop Slipping and Start Hooking?
Shop McLeod twin-disc clutches and hundreds more driveline upgrades at NLP Performance.
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