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View Poll Results: Have you taken your Manual JK in for non-maintenance repair. i.e. Jumping out of Gear
I've had a JK Manual that had transmission problems 67 14.73%
I've had a JK Manual without any major problems 336 73.85%
I've only owned 2 pedal JK's 15 3.30%
I've never had a JK / I just want to see the results 37 8.13%
Multiple Choice Poll. Voters: 455. You may not vote on this poll

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Old 02-14-2012, 05:58 PM   #151
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My 2nd and 3rd are harder to get in gear than the rest. But jeep seems to think this is normal. I'm sure it is with a jeep

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Old 02-14-2012, 07:23 PM   #152
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Only had 2008 JK X 6-speed 4 months without problems. Although I have had the RPMs drop to ~300-400 3 or so times while at a stoplight. Never stalled, but I always quickly gave it gas and it evened back out to 650-700 RPMs. Worried there might be a fuel injector problem.

e: I've also had 2nd gear be a bit sticky but nothing like my last car. Just needs a little love and finesse sometimes. Never ground any gears like previous stick.

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Old 02-14-2012, 08:26 PM   #153
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Quote:
Originally Posted by dwward
Only had 2008 JK X 6-speed 4 months without problems. Although I have had the RPMs drop to ~300-400 3 or so times while at a stoplight. Never stalled, but I always quickly gave it gas and it evened back out to 650-700 RPMs. Worried there might be a fuel injector problem.

e: I've also had 2nd gear be a bit sticky but nothing like my last car. Just needs a little love and finesse sometimes. Never ground any gears like previous stick.
You ever check/replace the PCV valve?
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Old 03-12-2012, 01:06 PM   #154
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Recently sold my 2006 LJ 6 spd with 71000 miles, no problems and bought a 2012 JK Sport 6 spd 800 miles, so far no problems
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Old 03-12-2012, 11:25 PM   #155
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2012 Rubi 6 speed

I put 200 miles on it before I noticed an odd rattling/scraping sound whenever I have the clutch pedal all the way to the floor. If I let the pedal up even just a hair, it goes away.

The dealer ordered a new clutch and throw out bearing. It goes back in the shop tomorrow to (most likely) have those items replaced.
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Old 03-13-2012, 01:35 AM   #156
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07- JK U "X"..... 37K miles, (used) No problems, shifts smooth, no noise, no issues..."BH"
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Old 03-13-2012, 07:27 AM   #157
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Quote:
Originally Posted by Baby Huey
07- JK U "X"..... 37K miles, (used) No problems, shifts smooth, no noise, no issues..."BH"
Yeh, probably the TOB. Same noise in neutral with foot off clutch?
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Old 03-13-2012, 08:27 AM   #158
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2012 - JKU 6 speed - just passed 1000 miles - no problems shifts smooth.
Just not sure I like 'Hill Start Assist' - know the wife does not.
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Old 03-13-2012, 08:33 AM   #159
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Originally Posted by biplane bob View Post
2012 - JKU 6 speed - just passed 1000 miles - no problems shifts smooth.
Just not sure I like 'Hill Start Assist' - know the wife does not.
Do you know that you can set the release threshhold every time you stop on a hill?
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Old 03-13-2012, 09:47 AM   #160
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No problems generally ... Only a few times when it popped out in really cold weather but I learned to shift slower and really set the gear.
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Old 03-13-2012, 07:33 PM   #161
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Well my 6mt is on order, but I will say this - popping out of gear is not good, cold or not. When cold it may be more difficult to shift into a gear, but it should never pop out.

It is quite possible though that due to the increased shift force required, people are not actually getting it fully in. Then a pop out is likely and maybe expected.

It has been mentioned here before, but double clutching when cold helps a ton. Especially in gears 1-3. This is good advice for any car w/ MT, regardless of design.
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Old 03-13-2012, 07:42 PM   #162
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2011 Rubi 6pd no issues
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Old 03-13-2012, 08:18 PM   #163
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I've had first pop a few times, I will admit that I noticed I was lazy shifting.. Since I have been making an effort to full lock 1st in I haven't had an issue.. Also grab first before reverse to line things up.
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Old 03-15-2012, 11:19 AM   #164
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My 2012 Wrangler Sport (6sp) has a horrible transmission! I took it to the dealer and their service techs don't know what's wrong with it. It makes a horrible rattle at high rpms in 3rd and 4th gear, the gears whine and 1st is really hard to engage when the vehicle is slowly rolling. Sometimes I have to double clutch it just to get 1st gear to work when rolling. Reverse grinds. The gear shifter shakes violently when vehicle is in 4th and 5th gear (I expect some movement, this is a truck transmission after all). Shifting from 1st to 2nd is super notchy as is 5th to 6th and when putting it into reverse. The clutch often has a crunchy feel when I press the pedal to the floor.

I took it back to the dealer and the service people topped off the transmission fluid and said it was fixed. I'll be taking it back tomorrow.
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Old 03-15-2012, 03:41 PM   #165
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Would someone please explain to me double clutch and its purpose? What does this do?
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Old 03-15-2012, 05:18 PM   #166
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2012 sport 2dr. with 6000miles. no problems so far.
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Old 03-15-2012, 05:47 PM   #167
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Quote:
Originally Posted by JimmEC
Would someone please explain to me double clutch and its purpose? What does this do?
Double clutch is simple really.. Push in clutch, take transmission out of gear, let out clutch, blip gas peddle, push on clutch, select gear.. Used when downshifting. Not up shifting..

What happens is when you let out the clutch ( out of gear) and blip the gas you are matching the Roma of the output shaft from the motor and the input shaft of the transmission aligning the gears.. This is less common with today's synchronized helicle gears. It is however helpful if your jumping from say 6th to 4th to pass or something..

Edit: I have to use it in my Subaru do to it having a fully built dog box (straight cut gears) with no synchronizers.

In case you don't know synchronizers are brass rings that have tapered grooves to help "guide" gears into each other for smooth engagement..
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Old 03-15-2012, 06:11 PM   #168
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o7 manual here. 26,000 miles. Never Jogged on me. Very happy I bought a Jeep with a handshaker!!
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Old 03-15-2012, 06:49 PM   #169
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Quote:
Originally Posted by JimmEC View Post
Would someone please explain to me double clutch and its purpose? What does this do?
Just about everything you wanted to know including several YouTube Videos that demonstrate double clutching.

how to double clutch - Google Search

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Old 03-15-2012, 07:22 PM   #170
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Quote:
Originally Posted by Celtic

Just about everything you wanted to know including several YouTube Videos that demonstrate double clutching.

how to double clutch - Google Search

My answer wasn't good enough ;p
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Old 03-15-2012, 07:30 PM   #171
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My answer wasn't good enough ;p
Picture is worth a thousand words? Video even more?

No offense intended. Just adding value IMHO and trying to help.



BTW, I used to live across the river from you in Cranberry. Really liked that part of PA. Still have my Terrible Towel.
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Old 03-15-2012, 07:33 PM   #172
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Trans

08 6 spd...won't but another one, if that helps you!!

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Old 03-15-2012, 07:39 PM   #173
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Quote:
Originally Posted by Celtic

Picture is worth a thousand words? Video even more?

No offense intended. Just adding value IMHO and trying to help.

Lol, never fear I don't take offense to much
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Old 03-15-2012, 11:01 PM   #174
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2011 2 door rubicon 6 speed 10000 + miles no problems
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Old 03-15-2012, 11:24 PM   #175
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Phobos' explanation was correct, but it is not used (nor really needed) for downshifting.

Double clutching allows for easier synchronizer "alignment" as it allows time for, in layman terms, the output shaft to "slow" to a closer speed to the choosen next gear. It also tends to unload the torque input/stress in the transmission. As Phobos said, you can also speed up the input shaft by "blipping" the throttle.

When downshifting, if it much better to blip the throttle after pushing the clutch in and then engaging the lower gear while the revs match closely to what the engine speed will be at that gear. Its difficult to do in a Wrangler because you are usually braking when downshifting and this thing is NOT made for heel-toe work. Technically you can rev match while double clutching too, but it shouldn't be necessary.

When upshifting, double clutching allows the "faster" input to slow to the next gear. And, it should only be needed in gears 1-2 when cold (at least in a modern, well maintain/operated transmission)
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Old 03-16-2012, 05:33 AM   #176
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Quote:
Originally Posted by Jurhip
Phobos' explanation was correct, but it is not used (nor really needed) for downshifting.

Double clutching allows for easier synchronizer "alignment" as it allows time for, in layman terms, the output shaft to "slow" to a closer speed to the choosen next gear. It also tends to unload the torque input/stress in the transmission. As Phobos said, you can also speed up the input shaft by "blipping" the throttle.

When downshifting, if it much better to blip the throttle after pushing the clutch in and then engaging the lower gear while the revs match closely to what the engine speed will be at that gear. Its difficult to do in a Wrangler because you are usually braking when downshifting and this thing is NOT made for heel-toe work. Technically you can rev match while double clutching too, but it shouldn't be necessary.

When upshifting, double clutching allows the "faster" input to slow to the next gear. And, it should only be needed in gears 1-2 when cold (at least in a modern, well maintain/operated transmission)
I've never had to double clutch on up shifts, man that would be slow as all can be... Just down shifts when I'm cruising in the race car around town..
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Old 03-16-2012, 05:50 AM   #177
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I've never had to double clutch on up shifts, man that would be slow as all can be... Just down shifts when I'm cruising in the race car around town..
Hey Phobos,

I don't think anyone has brought this up yet, but should we simplify shifting even more by talking about shifting WITHOUT the clutch. I used to do it all the time with the C4. It was a blast.
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Old 03-16-2012, 06:00 AM   #178
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Originally Posted by Celtic

Hey Phobos,

I don't think anyone has brought this up yet, but should we simplify shifting even more by talking about shifting WITHOUT the clutch. I used to do it all the time with the C4. It was a blast.
Lol, Jurhip briefly talked about rev matching.. I do it in my race car but that transmission is built for it.. When I say that I mean it's strong. Its built with straight cut gear that are wider then stock due to no synchronizers and better material.. To rev match on up shifts simply lift slightly off the gas to reduce gear load and grab the next gear on down shifts which I don't typically do there is a sweat spot in each gear where they will slide right into gear..
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Old 03-16-2012, 06:17 AM   #179
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Originally Posted by Phobos View Post
Lol, Jurhip briefly talked about rev matching.. I do it in my race car but that transmission is built for it.. When I say that I mean it's strong. Its built with straight cut gear that are wider then stock due to no synchronizers and better material.. To rev match on up shifts simply lift slightly off the gas to reduce gear load and grab the next gear on down shifts which I don't typically do there is a sweat spot in each gear where they will slide right into gear..
Great explanation by Ken.

Well, enough fun with stirring the gears (and pot) for awhile. Gonna go look and see what's happinin' on the rest of the WF.

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Old 03-16-2012, 10:55 AM   #180
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I've never had to double clutch on up shifts, man that would be slow as all can be... Just down shifts when I'm cruising in the race car around town..
Funny. I only have to double clutch on cold mornings during a 1-2 or 2-1 shift at low speeds.

Once warm, I'll rev match via heel toe on a downshift (if I have to brake). Upshiting - yeah, once warm no need to double clutch. A good car matches flywheel weight to clutch and shifter throw so that you naturally "rev match" with a gear change. The Jeep isn't a car, nor one designed for this

Straight cut gears - wear your earplugs!
And, I'm curious, what type of car are you running (vintage/pre-war racer?)

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