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  1. JT/JL Clutch and Flywheel explained by ACT

    Here are a couple: Wrangler JL: https://www.jlwranglerforums.com/forum/threads/exploded-jl-clutch-detailed-look-testing-by-advanced-clutch-technology.111416/page-7#post-2331384 Gladiator...
  2. ACT Gladiator Clutch/Promass flywheel installed

    How are you liking the clutch/flywheel now that it has been in for a few weeks? What are your further thoughts about the extra inertia?
  3. Clutch Recall (2/23/23): Clutch Pressure Plate May Overheat -- Affecting 70,000 Manual Jeep Wranglers and Gladiators

    How are you concluding this? The engine makes 260ftlbs. According to the math, the clutch has a torque capacity of 363 ftlbs new. For comparison, we tested a used clutch at 62K as it came out of the car and the clamp load was reduced by a little over 16% making the torque capacity about...
  4. Stop sale on manual transmission Gladiators (clutch assembly may overheat, causing a fire)

    LOL! From my understanding CF also makes a good option to the stock clutch.
  5. Stop sale on manual transmission Gladiators (clutch assembly may overheat, causing a fire)

    I don't have time to rehash all the information in a reply and I am sure I would miss something. Check out my previous posts and threads.
  6. Clutch Recall (2/23/23): Clutch Pressure Plate May Overheat -- Affecting 70,000 Manual Jeep Wranglers and Gladiators

    I would recommend the JP6-HDSS for just about all JT/JL application, especially towing. The heavier flywheel really improves the drivability, imo.
  7. Clutch Recall (2/23/23): Clutch Pressure Plate May Overheat -- Affecting 70,000 Manual Jeep Wranglers and Gladiators

    If you are rethinking, consider the ACT which is less expensive, doesn't require custom hydraulics and you have the choice of two different flywheels.
  8. Clutch Recall (2/23/23): Clutch Pressure Plate May Overheat -- Affecting 70,000 Manual Jeep Wranglers and Gladiators

    Here is a thread I started explaining more about the JL/JT clutch. https://www.jeepgladiatorforum.com/forum/threads/jt-jl-clutch-and-flywheel-explained-by-act.68758/
  9. JT/JL Clutch and Flywheel explained by ACT

    ACT Clutch Development: Here is an informal video explaining how we developed the JL/JT clutch. Hopefully after reviewing this thread, you will have a better understanding about JL clutches. I think our product will speak for itself. For product information, install videos and more, go to...
  10. JT/JL Clutch and Flywheel explained by ACT

    JL Pedal load test results: The pedal load graph explains why the pedal felt so terrible on the used JL we had in the shop at only 20,000 miles. The pedal was showing less than 2 pounds of force on the return stroke at one point. Incidentally this is the same clutch shown in the earlier videos...
  11. JT/JL Clutch and Flywheel explained by ACT

    Test Results and Comparison: The following chart shows data from several clutches in our discussion. The reason I chose the Ford and BMW clutches is because they share similar or identical components to the JL/JT. For instance, the floater plate, drive plate and rivets look the same. Since...
  12. JT/JL Clutch and Flywheel explained by ACT

    Testing: Once we determine the platform we want to use for an application, to properly design a clutch there are several tests and evaluations we routinely perform. The most basic data points are clamping force, working range, bearing load, release travel and drivability (in-car feel)...
  13. JT/JL Clutch and Flywheel explained by ACT

    Clutch Capacity: Let’s look at some characteristics that determine the performance of a clutch: Torque capacity: The most fundamental calculation to determine clutch performance is for torque capacity. The formula used to calculate torque capacity of a clutch can be depicted as N x R x F x P =...
  14. JT/JL Clutch and Flywheel explained by ACT

    General Opinions: If everything is working properly, the stock parts should sufficiently handle the standard torque of the Pentastar and withstand normal driving. In my opinion the failures that have occurred are probably not directly caused by the internal clutch parts. Of course, that is still...
  15. JT/JL Clutch and Flywheel explained by ACT

    General Opinions: If everything is working properly, the stock parts should sufficiently handle the standard torque of the Pentastar and withstand normal driving. In my opinion the failures that have occurred are probably not directly caused by the internal clutch parts. Of course, that is still...
  16. JT/JL Clutch and Flywheel explained by ACT

    JL clutch design and components: The next video shows how different the design is from the JK but similar it looks to a couple other applications that have little in common to the JL. The details will be useful later in our conversation. Let’s start with a couple videos that describe a...
  17. JT/JL Clutch and Flywheel explained by ACT

    Stock JL/JT clutch, behind the wheel: ACT’s first Impressions: What we first noticed driving a new JL, was how light and vague the pedal feels. We had no idea how much worse it gets over time, until we had a used JL in the shop. More on that to follow. Here is what automotive journalists had to...
  18. JT/JL Clutch and Flywheel explained by ACT

    Gladiator Clutch and Flywheel Explained If you really want to know all about the JL/JT clutch, this is your bet place to start. This is actually a repost from the JL forum since they share the same clutch. I have been working on performance/racing automobile clutches since 1979 and started...
  19. Stop sale on manual transmission Gladiators (clutch assembly may overheat, causing a fire)

    I finally got the clutch information done and shared on the JL forum here: https://www.jlwranglerforums.com/forum/threads/exploded-jl-clutch.111416/ Now reposted on the Gladiator forum here: https://www.jeepgladiatorforum.com/forum/threads/jt-jl-clutch-and-flywheel-explained-by-act.68758/
  20. ACT Gladiator Clutch/Promass flywheel installed

    I finally got the OEM clutch information done and shared on the JL forum here: https://www.jlwranglerforums.com/forum/threads/exploded-jl-clutch.111416/ Now reposted here on the Gladiator forum: https://www.jeepgladiatorforum.com/forum/threads/jt-jl-clutch-and-flywheel-explained-by-act.68758/




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