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Old 02-27-2012, 11:45 AM   #1
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2012 tranny experts, what do you think?

I now have 1200 miles on my JKUR and besides not being able to take the top off due to weather, I couldn't be happier. I have noticed an odd feature of the auto tranny though and was wondering if anyone else has noticed this as well. When I am under load, such as driving on a steep incline or accelerating heavily (which I never do of course ), my tachometer will dip ~100-200 RPMS in 2nd gear only as I accelerate. I can feel the slight dip and I have never seen a dip in RPMs when accelerating, seems like something is slipping. No codes, MPGs have been great considering most of my driving is in city, no other problems. PCM shift point problem?? I have reset the computer twice now and it still occurs.
Any thoughts?

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Old 02-27-2012, 12:10 PM   #2
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Torque converter lockup?

If so, totally normal.


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Old 02-27-2012, 12:11 PM   #3
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If something were slipping you wouldn't see a dip in RPM's.
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Old 02-29-2012, 02:15 PM   #4
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I don't suspect it is torque converter lockup, but that was initially what I dismissed it as. It only happens in 2nd gear and the RPM dip will occur roughly halfway through acceleration in that gear. The dip will only occur sometimes, very intermittent and annoying. Does anybody else have this issue?
Oh yeah, it does NOT happen when manually shifting through the gears, only when in D.
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Old 02-29-2012, 02:19 PM   #5
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My Grand Cherokee does exactly what you are describing, haven't noticed yet if the JK does it. I always just figured TC locking up as well.
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Old 02-29-2012, 02:20 PM   #6
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For what it is worth...I have not seen this issue in my '12 JK sport..but I don't drive very aggressive as a rule. But I think I would have noticed it if it was going on, the few times I have accelerated hard from a light or something like that.

have never changed anything from stock though.....good luck
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Old 02-29-2012, 03:31 PM   #7
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1200 miles. Its most likely a break in behavior with the bands. Keep running the Jeep as normal. It can take up to 5k to break her in even a tad.
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Old 02-29-2012, 04:34 PM   #8
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Great responses, thank you guys. I'll keep an eye on her and just keep on jeepin'!
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Old 03-28-2012, 07:52 AM   #9
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Late on posting a reply - but I think my 2012 2-dr sport does the same thing. I have 33" Nitto Trail Grapplers on 16" steel wheels, a 2 1/2" lift, and Smittybilt XRC bumpers front & rear - so I know I have a lot of load on it. BUT, even before I put all that on, I noticed the strange shift points occurring. Seems to almost "bog down" at times - choosing a higher gear at a lower rpm instead of staying jn a lower gear to provide the torque I really need. I've definitely watched the rpm's drop as well when when I have my foot on the gas at times. Unsure what gear though. I usually just stop it to the floor to get it to down shift to give me the power I need.

I make a regular 60 mile highway trip which had lots of uphill climbs. It's very frustrating at times...wonder if I pull the batter cable and do a "reset" if anything would change? I could always do the pretend manual shift...but I bought an auto to shift for me on the regular roadways...
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Old 03-28-2012, 08:00 AM   #10
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That's definitely not slipping. An auto trans slipping will feel more like a hang up between gears, like it wants to shift but it's just not going in, then it finally goes in. (that doesn't sound right at all)
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Old 03-28-2012, 08:44 AM   #11
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My 2012 JK Arctic does this and so does my coworkers 2012 JKUR. It's just the torque converter slightly locking in second gear...It almost makes the transmission feel like it's a 6 speed and not a 5. Basically it's shifting from first to second, then a slight torque converter lock in second then a shift to third and so on. It's just part of the shifting program...Nothing wrong.
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Old 03-28-2012, 01:49 PM   #12
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I can run 1st gear up to about 3K, it shifts to 2nd, drops a little in RPMs and shifts into 3rd at about 2K. Then I have to gas the &^*&! out of it, sucking up gas, to downshift back to 2nd and actually accelerate. I'm not driving like a granny when it shifts from 2nd to 3rd either, my foot is way in it to get it to downshift.

"Everything is perfectly normal Mr 12JKUR"

I hear it's a Chrysler thing
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Old 03-28-2012, 02:04 PM   #13
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Quote:
Originally Posted by sknyfats
Late on posting a reply - but I think my 2012 2-dr sport does the same thing. I have 33" Nitto Trail Grapplers on 16" steel wheels, a 2 1/2" lift, and Smittybilt XRC bumpers front & rear - so I know I have a lot of load on it. BUT, even before I put all that on, I noticed the strange shift points occurring. Seems to almost "bog down" at times - choosing a higher gear at a lower rpm instead of staying jn a lower gear to provide the torque I really need. I've definitely watched the rpm's drop as well when when I have my foot on the gas at times. Unsure what gear though. I usually just stop it to the floor to get it to down shift to give me the power I need.

I make a regular 60 mile highway trip which had lots of uphill climbs. It's very frustrating at times...wonder if I pull the batter cable and do a "reset" if anything would change? I could always do the pretend manual shift...but I bought an auto to shift for me on the regular roadways...
You set for different tire size.

The shift points will all be ef'd up
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Old 03-28-2012, 03:43 PM   #14
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Quote:
Originally Posted by 12JKUR View Post
I can run 1st gear up to about 3K, it shifts to 2nd, drops a little in RPMs and shifts into 3rd at about 2K. Then I have to gas the &^*&! out of it, sucking up gas, to downshift back to 2nd and actually accelerate. I'm not driving like a granny when it shifts from 2nd to 3rd either, my foot is way in it to get it to downshift.

"Everything is perfectly normal Mr 12JKUR"

I hear it's a Chrysler thing
Actually, the tranny is made and designed in Germany by Mercedes-Benz. The tranny is actually an excellent, bullet-proof design. I think it just has this torque converter lockup that is tricking people...including myself. It does tend to bog once in a while though.....
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Old 03-28-2012, 11:33 PM   #15
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Originally Posted by GCDMD View Post
Actually, the tranny is made and designed in Germany by Mercedes-Benz. The tranny is actually an excellent, bullet-proof design. I think it just has this torque converter lockup that is tricking people...including myself. It does tend to bog once in a while though.....
I realize where it came from and not saying it isn't bullertproof, just that there are *much* nicer automatic transmissions in Mazdas, Hondas and VW's (I think VW is the leader in ATs lately).
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Old 04-02-2012, 09:21 PM   #16
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The NAG1 (WA580/W5A580) has some torque management in it's cpu. Here is a common quote:

"Some critics complained about the sometimes-heavy-handed torque management applied to keep the WA580 reliable, with the engine cutting power noticeably on shifts"

Mercedes NAG1 / WA580 automatic transmission for Dodge, Jeep, and Chrysler
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Old 04-03-2012, 12:26 AM   #17
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It has been my experience with first a 2006 Civic and then a 2010 Sienna both with automatic trannys and both throttle by wire. They both had terrible driving characteristics. I think its just the way these transmissions work with all the computer and throttle by input. I believe its a glitch and no one will admit to it. I know there is a device for my mini that eliminates this but the mini is a standard shift so the problem doesn't exist. My jeep should be here Wednesday. If it does the same thing as your explaining and my other two did, then I think I am spot on.
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Old 04-03-2012, 11:48 AM   #18
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Honda arent so graceful, better than the jeep.

Couple 2, 3 YO mazdas here have great ATs, VW w/DSG AT is awesome.

Not all mfgs send out crappy TBW.
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Old 04-04-2012, 10:14 AM   #19
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Quote:
Originally Posted by 12JKUR View Post
Honda arent so graceful, better than the jeep.

Couple 2, 3 YO mazdas here have great ATs, VW w/DSG AT is awesome.

Not all mfgs send out crappy TBW.
I think the best tranny I have ever had the pleasure of driving is my wife's 6 speed auto in her escape. Ridiculously smooth, very intuitive and it never seems to lug. I do find that the tranny in the wrangler is a little heavy-handed, just like that article stated. It works very well and seems robustly made, just a different feel than I am used to. I wouldn't say that Honda (having driven a civic for 2 miserable years), VW or any other manufacturer tranny is much better. More predictable and refined? Perhaps, but not much better. Besides, I only have 2000 miles on my JKUR, it is still breaking in as far as I am concerned.
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Old 05-15-2012, 11:48 AM   #20
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Originally Posted by 12JKUR View Post
I can run 1st gear up to about 3K, it shifts to 2nd, drops a little in RPMs and shifts into 3rd at about 2K. Then I have to gas the &^*&! out of it, sucking up gas, to downshift back to 2nd and actually accelerate. I'm not driving like a granny when it shifts from 2nd to 3rd either, my foot is way in it to get it to downshift.

"Everything is perfectly normal Mr 12JKUR"

I hear it's a Chrysler thing
This same thing happens to me, and I was going to post a new thread asking for opinions until I found this and your reply explained my situation perfectly. I've had my new '12 JKU two weeks so far and it now has 1100 miles on it. As I've been slowly getting accustomed to its characteristics, I've been noticing that whenever I take off from a stop, if I accelerate hard or even just a little hard, the tranny will let the engine run up to close to 3K RPM before it finally shifts into 2nd gear. It then remains in 2nd for what seems like no more than 1-2 seconds and then quickly shifts into 3rd. Seems to me like it's in 1st gear way too long and revs much higher than it should before shifting, it's in 2nd nowhere near long enough to properly accelerate, and then 3rd, 4th, etc seem fine. Was thinking it's just me and wondering if it's a tranny problem, but it sounds like it's not just me. The real question is -- is this "normal"? To me it's not. I've had countless auto trannies, three of which have also been 4WD vehicles, and NONE of them have shifted in this manner. Torque converter? Maybe...but still doesn't seem "normal" to me.

By the way, it seems like this happens MOSTLY when the engine is cold. It sometimes does it when it's warm too, but not all the time. Oh, and if I start off very slowly from a stop, it shifts through all gears perfectly normal, nice and easy. It only seems to overuse 1st gear and underuse 2nd when it's cold or on hard accelerations.

Thoughts? Is it worth me worrying about it? This is my first Jeep, so maybe it's one of those "Jeep things" I may not understand yet.
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Old 06-28-2012, 06:50 PM   #21
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I have the same or similar tranny problem as you "Silencer" and mine only does it when its cold as well. From 1st going into second and from 2nd into 3rd then all is fine after that also once I drive like 5 miles its gone for the rest of the day only does it in the mornings. Took mine to the dealer like 3 times already and the same bs story that its normal and that they did a software update on the transmission n all is normal. But now that its hot in AZ it does a similar thing when down shifting from 2nd or 3rd it like stays in the current gear longer then it should then kicks out a little rough right as the speed and rpms reduce.

I have two 2012s rubicons and only one does it. Any ideas on this or anyone else experiencing this problem and got it fixed.

Thanks
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Old 06-15-2013, 10:37 PM   #22
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I do not think it is normal. Neither does my dealership. I am currently waiting approval from Chrysler for a new transmission.

http://www.wranglerforum.com/f33/13-...er-240741.html
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Old 06-15-2013, 10:43 PM   #23
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to add more, mine was initially diagnosed as a pressure issue likely due to a sticking solenoid. They replaced the valve body and that did not fix the issue. I would call mine a stutter in 2nd, like a second 2nd gear. mine occurs nearly 100% of the time, cold, hot, slow accel, hard accel, in full auto, or in "manual' shift mode. Shifts from first to second, RPMS climb, then the stall, dip ever so slightly and then climb again, then into 3rd, 4th, 5th. I initially thought it was skipping 2nd or quickly going into third, but when I use the "manual" mode it is clearly a 2nd gear issue. I think the torque converter lockup explanation is BS, I've driven plenty of vehicles and never had an issue like this.

I'll keep my post linked above up to date for anyone else experiencing this.
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Old 06-19-2013, 12:21 AM   #24
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Mine does the torque converter lockup in 2nd as well unless you're feather-light on the gas or very heavy on the gas. Otherwise, it's noticeable and it's clearly the torque converter staying unlocked after the shift to 2nd (so as to prevent lugging) and then locking up (causing the dip in rpm) and a more direct feel between the throttle and acceleration.
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Old 06-19-2013, 01:03 AM   #25
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I have a 2010, but when I'm cruising in 3rd (od off) the RPMs will rise by like 100 and stay there. Is that the trans slipping?
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Old 06-19-2013, 01:42 AM   #26
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My six speed seems to keep the RPMs exactly where they should be relative to the gas pedal.

If I want them higher, I press the clutch and drop a notch!

Auto = computer control. Manual = driver control
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Old 06-19-2013, 09:50 AM   #27
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Transmission Recall?

Probable different topic, but a couple of weeks ago the news said Jeep was recalling transmissions on 2012 & 2013 Wranglers. I couldn't hear if it was manuals or automatics. I started looking on the Forum if someone had started a thread and found this one.

I'll keep looking and start a thread if I have to.

There were thousands recalled so I doubt if it was my manual because it was probably the automatics, but I've just started my search so feel free to post here if you know.

thanks,

-terry
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Old 06-19-2013, 10:08 AM   #28
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My '13 JKU does this as well. I have 3700 miles on it and one of the things I noticed when I first bought it was "wow, this thing shifts crisply!". Well that sure has changed! When accelerating, the engine seems to just rev once the tranny goes to second gear. I have to push the gas harder and the tranny will uhm 'kick in' and accelerate nicely again.

The best way I can describe it is that it feels like the tranny shifts to 2nd and 2nd gear is too 'tall' so the engine just revs and everything bogs down. Hitting the gas harder will kick the tranny back down to first and with strong acceleration and when it does shift to 2nd again the wrangler will be at a faster, more acceptable, speed for that gear. **Of course this isn't what's really happening**, i'm just trying to describe it.

I might visit the dealer but this annoyance doesn't really affect me. What does bother me is the possible damage that could be occurring.. perhaps low fluid, etc.
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Old 06-19-2013, 10:32 AM   #29
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Probable different topic, but a couple of weeks ago the news said Jeep was recalling transmissions on 2012 & 2013 Wranglers. I couldn't hear if it was manuals or automatics. I started looking on the Forum if someone had started a thread and found this one.

I'll keep looking and start a thread if I have to.

There were thousands recalled so I doubt if it was my manual because it was probably the automatics, but I've just started my search so feel free to post here if you know.

thanks,

-terry
The recall on automatics was for the trans cooling line being rubbed through by another line and leaking. Its a relatively minor problem.
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Old 06-19-2013, 02:05 PM   #30
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Thumbs up Actually It's a Power Steering Recall

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The recall on automatics was for the trans cooling line being rubbed through by another line and leaking. Its a relatively minor problem.
Yes. Edmunds says it's a power steering line rubbing a trans cooler line.
2012 Jeep Wrangler Recalls
Mine's a manual so it's infinitely minor for me.

thanks much,

-terry

I had the nut on the metal tubing part of a power steering line rub on the power steering pump casing on an '89 Chevy 1500. With a truck that old I figured the pump casing would outlast the engine. It didn't. It finally wore a hole in the casing and leaked power steering fluid until I replaced the pump.

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