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Old 11-26-2019, 01:40 AM
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JK Clutch / Tranny issues

Last year I had a shop replace my clutch/pp/flywheel with the Centerforce kit in my 2012 JK Sport. All was well for around 10k miles and then shifting into first or reverse would sometimes be difficult with the engine running. If the engine was off, shifting in those gears was no problem. When sitting at a light in 1st gear and the clutch engaged and brakes off, the Jeep pulls forward slightly. I'd say it's difficult like this at least half the time. Other times, it goes right into gear with no problem.

I eventually replaced the slave cylinder and it didn't change much at all. So, I replaced the master cylinder and it was still the same. I read that it's fairly common for the slaves to fail so I replaced it again with the same result. Very frustrating...

My next step is to have a shop pull the Tranny and inspect the clutch and components. My only thought is a bent fork maybe? What do you guys think?

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Old 11-26-2019, 03:42 AM   #2
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Watch and learn.

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Old 11-26-2019, 05:55 AM   #3
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Thanks for posting the video. It was informative.
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Old 11-26-2019, 11:07 AM
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Thanks for the video. I acknowledge that some of the the issues addressed in the video could be at play but it doesn't address why the clutch isn't fully engaged when the pedal is depressed. I believe that's the primary reason it won't easily go into the low gears (1st and reverse).

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Old 11-26-2019, 12:21 PM   #5
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If you pump your clutch pedal does it help? You could possibly have a worn clutch pedal bushing maybe also, where the pedal rides on the shaft under the dash.
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Old 11-26-2019, 03:03 PM   #6
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Thanks for the video. I acknowledge that some of the the issues addressed in the video could be at play but it doesn't address why the clutch isn't fully engaged when the pedal is depressed. I believe that's the primary reason it won't easily go into the low gears (1st and reverse).

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If your synchro's are bad or if the forks are not aligned correctly it does. If you clutch is not fully engaged in 1 gear it would happen in every gear.
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Old 11-26-2019, 04:02 PM
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If you pump your clutch pedal does it help? You could possibly have a worn clutch pedal bushing maybe also, where the pedal rides on the shaft under the dash.
Nope. Pumping does nothing and the pedal is solidly in place.

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Old 11-26-2019, 07:53 PM   #8
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My son's 2015 JKU had a rattling sound in 1st and 2nd gear and he was told by the dealer it was the clutch, since is a wear item it's not covered by the warranty.

A shop installed a Centerforce II clutch and sure enough the rattling was still there.
Now back a the dealer and he has been without his Jeep for over 2 months waiting for a transmission.
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Old 11-27-2019, 03:38 AM   #9
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My son's 2015 JKU had a rattling sound in 1st and 2nd gear and he was told by the dealer it was the clutch, since is a wear item it's not covered by the warranty.

A shop installed a Centerforce II clutch and sure enough the rattling was still there.
Now back a the dealer and he has been without his Jeep for over 2 months waiting for a transmission.
Could be input shaft bearing.

Iím subbed though as I have a Centerforce clutch and flywheel sitting in the garage.
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Old 11-27-2019, 02:13 PM   #10
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My son's 2015 JKU had a rattling sound in 1st and 2nd gear and he was told by the dealer it was the clutch, since is a wear item it's not covered by the warranty.

A shop installed a Centerforce II clutch and sure enough the rattling was still there.
Now back a the dealer and he has been without his Jeep for over 2 months waiting for a transmission.
Hi jku007fl,
We're sorry to hear about your experience. If you would like any additional assistance while working with your dealer, please send our team a PM. We'd be happy to connect you with a Case Specialist to assist.
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Old 11-27-2019, 07:51 PM   #11
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Interesting, thank you.
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Old 11-28-2019, 02:40 AM
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Someone mentioned their Jeep had similar issues and it turned out to be loose bolts. I'm going to have a shop pull the Tranny and inspect it to either confirm or dismiss it. I'll post up the results when completed for future reference.

Here's the note on this person's experience: "What was going on is one of the nuts holding the pressure plate/clutch assembly together was slowly backing off and allowing the pressure plate to "cock" a bit.* As such the outer edge of the disk was not fully releasing.* This drag kept pressure on the trans and made shifting into 1 or R difficult".*

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Old 11-29-2019, 04:57 AM   #13
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Start with a proper bleed, and test of your master and slave cylinder. make sure they area sealed nice and not leaking, after this i would remove your clutch inspection plate and watch your clutch disengage from pressure plate. Sounds to me like you aren't getting a full release of the clutch and you aren't able to go into gear while she is running.

I just rebuilt my 86 jeep cherokee after the shop gave it back to me in pieces and missing peices and told me my transmission and transfercase were shot.
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Old 11-29-2019, 05:11 PM   #14
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Start with a proper bleed, and test of your master and slave cylinder. make sure they area sealed nice and not leaking, after this i would remove your clutch inspection plate and watch your clutch disengage from pressure plate. Sounds to me like you aren't getting a full release of the clutch and you aren't able to go into gear while she is running.

I just rebuilt my 86 jeep cherokee after the shop gave it back to me in pieces and missing peices and told me my transmission and transfercase were shot.
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Old 11-30-2019, 03:35 AM   #15
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Old 12-07-2019, 03:47 AM
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Well, I had the clutch, pressure plate, bearings and fork replaced and that did the trick. There was no real evidence that something was wrong except for the throwout bearing was really worn and mashed up on the contact end. Not sure what caused that. Anyway, glad to be shifting easily again. Thanks for everyone's input!

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Old 12-09-2019, 08:38 AM   #17
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Well, I had the clutch, pressure plate, bearings and fork replaced and that did the trick. There was no real evidence that something was wrong except for the throwout bearing was really worn and mashed up on the contact end. Not sure what caused that. Anyway, glad to be shifting easily again. Thanks for everyone's input!

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How much did that run for the bearings and fork since you already did the clutch? Or did they re-do it all w/forks?
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Old 12-13-2019, 03:09 AM
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How much did that run for the bearings and fork since you already did the clutch? Or did they re-do it all w/forks?
They replaced the whole Centerforce kit. Everything but the flywheel.

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