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Dang! You weren’t supposed to see that yet! I am putting a thread together with JL clutch info and that’s just part of it.

Engagement should be about mid-stroke according to our tests so I am curious about that. We will have a Gladiator in the shop in two weeks for another install video and further testing.

The stock clutch is definitely a twin disc.

Not really. Torque spikes much greater than simple engine torque can far out exceed the damping spring rates in the dual-mass flywheel or a spring center disc. The biggest cause for transmission or driveline damage from peak loads would be a loose nut behind the wheel.

It is going to be higher MOI. I usually don't recommend the 6 puck because it is way overkill for over 95% of the JL/JT's. Basically the same 11" disc we put on many LS powered drift cars (except the splines).

MOI comparison: Stock JL = 22.1 lb*in² ACT JL = 50.2 lb*in²

We are reorganizing the shop and moving my testing bench (with MOI tester) today. I should get a chance to get the numbers tomorrow.

Great question! There is definitely an increase of Inertia when running a spring center 11" single disc compared to the two 8.5" solid center discs. I can get numbers if you like. How that affects the wear on syncros is largely up to driver driving habits and the quality of the syncros. We tried...

The travel is measured in inches from left to right. The scale top to bottom is the effort (load) it takes to press the pedal measured in pounds. The higher curves are when you are pushing down on the pedal, the lower curves are the return force against your foot as the pedal comes up. Can you...

Let's see if this graph answers that for you. These are actual pedal tests done at ACT.

I don't see that as an advantage. It feels terrible on the Jeep IMO. It is marginal new, but after twenty thousand miles, the pedal feels awful. I will explain other advantages and tradeoffs in another thread later.

It appears CF is adapting the JK hydraulics to the JL/JT to increase release bearing travel to operate their larger 10.4" clutch. The difference in both cylinder sizes make a small change in the hydraulic ratio.

There are advantages to a dual disc clutch design. I just don't see any of them making sense for the Jeep JL/JT.

A dual-mass flywheel has unique torsional dampening characteristics that reduce transmitting engine pulses to the transmission, therefore reducing gear rattle noise. Also by putting the dampening before the clutch, solid center discs can be used which lowers loads on the synchronizers. I don't...

I wish people could still buy them so they could replace the clutch with ours!

Best solution? Hum, or... https://www.advancedclutch.com/articles/new-product-press-releases/ACT-Releases-SFI-Approved-Performance-Clutch-Kits-for-JEEP-Wrangler-JL-Gladiator-JT-Applications Of course I might be a bit prejudice. Haha.

The stock flywheel weighs 29.5lbs and the whole stock clutch/flywheel assembly weighs 49.5lbs. For a comparison, the important number is the moment of inertia (MOI), not weight. I haven't tested the StreetMass behind the wheel, but the heavier ProMass feels really well matched to the vehicle in...

I am not an expert on the Centerforce JL/JT product (haven't tested it), but I do have over 40 years experience developing performance/racing clutches. On the JL/JT platform, the main differences I know of: Centerforce offers a 10.5" pressure plate and adapt the JK hydraulics to increase release...

I am afraid not. I always hesitate to recommend an installer, unless I have personally experience with them.

Because of the issues people are having and the lack of feedback to the driver with the stock clutch, I would recommend our clutch for any JL/JT. The added inertia of the ProMass versus our StreetMass flywheel is a matter of preference, but personally I like the heavier ProMass even for a stock...