ACT 18-22 Jeep Wrangler JL / 20-22 Gladiator JT Pro Mass HD-O / Street Sprung Clutch Kit

Wrangler JL and Gladiator JT owners with the six-speed manual know the story: a clutch that smells hot after a slow rock crawl or a long climb with a trailer, a pedal that feels different when the clutch gets warm, and in some trucks a recall visit for the pressure plate. ACT kit JP6-HDSS is its answer for the 3.6L Pentastar manual trucks. It pairs ACT's Heavy Duty pressure plate with a sprung organic street disc and its own XACT Pro-Mass flywheel, so the whole clutch and flywheel are replaced in one job.

What the HD-O street clutch does in a JL or JT

ACT rates JP6-HDSS at 479 ft-lb of torque capacity at the crank, 32 percent above the original clutch. The extra holding power comes from ACT's diaphragm design, which raises clamp load and reduces deflection, and every diaphragm goes through a four-stage heat treatment. The 11 inch (280 mm) disc uses steel-backed premium organic friction material on a sprung hub that fits the 1.125 inch input shaft, so engagement stays smooth for trail work and daily driving. ACT describes the feel as light to moderate pedal effort with OE to mild gear rattle.

ACT calls this a conversion kit. Everything in the box is new, according to ACT's kit contents list:

• 601325 XACT Pro-Mass flywheel, with flywheel bolts (M10-1.00 x 40 mm)
• J014 Heavy Duty pressure plate, with pressure plate bolts (M8-1.25 x 16 mm)
• 3001829 Performance Street sprung disc
• RB018 release bearing and AT71 alignment tool

Expect a heavy box: ACT lists the kit at 62.6 lb.

Symptoms that send JL owners shopping for a clutch

• Slip on steep climbs, when towing, or after bigger tires and lower gears were added
• Burnt clutch smell after slow technical trails where the clutch is feathered
• Judder on takeoff in first or reverse
• Pedal feel or engagement point that changes as the clutch heats up
• A noise that changes or goes away when the pedal is pressed, pointing to the release bearing

The heat problem on these trucks is documented. FCA recalled 2018-2023 Wrangler and 2020-2023 Gladiator manual trucks because the clutch pressure plate can overheat and fracture (NHTSA campaign 23V-116, which replaced 21V-028 and followed 20V-124). Check that your VIN has had the recall work done; on a stock truck the dealer remedy comes first.

How to confirm before you buy

With the engine warm, pull in a high gear from low rpm at full throttle. Rpm rising faster than road speed means slip. Check the clutch fluid level and look for leaks at the slave, because a hydraulic fault can mimic a worn disc. Our slipping diagnosis guide covers the basic test, and the JL transmission replacement cost page helps you price the labor.

Fitment

Our listing covers the 2018-2022 Jeep Wrangler JL and 2020-2022 Gladiator JT. ACT's current chart lists the same part for the 3.6L V6 manual Wrangler JL from 2018 into 2026 and the Gladiator JT 3.6L from 2020 through 2024, across Sport, Sport S, Sahara, Willys, Rubicon, Mojave and other trims. It is for the six-speed manual only; automatic trucks have no clutch. Send us the year, trim and last 8 of the VIN if you want a second check. For a different setup, compare the McLeod Trail Pro Pack for the JL. If you own the older JK, the matching kit is the ACT JP4-HDSS. Browse more in our rebuild kits department.

Install notes

• Install the new Pro-Mass flywheel and pressure plate with the bolts supplied in the kit, torqued to the factory spec in a crisscross pattern.
• Center the disc with the AT71 tool before the cover bolts are snug.
• Fit the new RB018 release bearing and inspect the slave while the gearbox is out.
• Bleed the hydraulics fully; see our clutch bleeding guide.
• Pedal effort will rise. ACT puts its Heavy Duty plates at 15 to 40 percent more than stock.
• Break in the organic disc for 300 to 500 miles of easy stop-and-go driving before trail use or towing.

Does this fit a Wrangler JL with the automatic?

No. JP6-HDSS is for 3.6L V6 Wrangler JL and Gladiator JT trucks with the six-speed manual transmission. Automatic trucks use a torque converter, not a clutch.

Is the flywheel included?

Yes. The kit includes ACT's XACT Pro-Mass flywheel (601325) with flywheel bolts, plus the Heavy Duty pressure plate, sprung street disc, release bearing and alignment tool.

Should I get the recall done first?

On a stock truck, yes. FCA's recall 23V-116 covers clutch pressure plate overheating on 2018-2023 Wrangler and 2020-2023 Gladiator manual trucks. Have a dealer check your VIN. This kit is for owners who want more holding power than stock.

Will it handle bigger tires and towing?

ACT rates it at 479 ft-lb at the crank, 32 percent over stock, with a disc built for street and off-road use. That margin is what most owners want after a tire and gear upgrade.

How do I break in the new clutch?

ACT recommends 300 to 500 miles of mild stop-and-go driving on organic street discs before hard use. Do not overheat it during break-in.

• Transmission Slipping Diagnosis Guide
• Automatic vs Manual Transmission Repair Cost
• Rebuild vs Replace vs Reman Transmission