Shifting from 4th to 5th - Page 2 - 2014+ Jeep Cherokee Forums
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post #11 of 27 (permalink) Old 11-30-2016, 01:03 AM
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In looking back over the posts, it seems this is a 2015 model year problem.
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post #12 of 27 (permalink) Old 11-30-2016, 10:44 AM
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Quote:
Originally Posted by jeepfan4x4 View Post
The trick is to very quickly accelerate it to about 50-55MPH, so your RPMs are very high and it never gets to fifth because you're pedal to the metal... then literally take your foot off the gas. You should be at 4500 RPM or more (V6). If it suddenly acts like it has runaway acceleration for a few seconds, then you have experienced the dog clutch effect.


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Tried this the other day. Smooth as satin!

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post #13 of 27 (permalink) Old 11-30-2016, 10:56 AM
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The OP asked about the "slam felt thru the entire car" during a shift from 4th to 5th which requires the dog clutch to engage. That is an anomaly that should not happen; but it does on occasion for certain people, including me.

The runaway feel is something different that is normal and due to the rev match done to enable the shift. It is most noticeable when decelerating when the driver is expecting the vehicle to slow due to engine braking but at the 5-4 shift the computer blips the throttle to enable a smooth engagement of the dog clutch. I notice it most when exiting a freeway at speed.
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post #14 of 27 (permalink) Old 11-30-2016, 11:07 AM
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Mine did it yesterday, at 45 mph it usually wants 6th. I got to 45 in 4th and it acted like I clutched on a manual, the RPMs revved up as I was still accelerating and it felt like I went into neutral. After about one second it grabbed again in either 5th or 6th. I just usually ignore it because it shifts so smoothly outside of this scenario and I know it's related to the dog clutch switching over to the next range of gears.


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post #15 of 27 (permalink) Old 11-30-2016, 11:27 AM
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Going to the dealer and getting the most recent TCM and PCM reflashes can be helpful.
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post #16 of 27 (permalink) Old 12-02-2016, 11:49 PM
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I re-read a description of the 9-speed's operation and it seems that 5th gear disengages the dog clutch, not engages it. For 5th, the dog clutch disengages and one of the regular wet-plate clutch packs engages.

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post #17 of 27 (permalink) Old 12-03-2016, 01:42 AM
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Originally Posted by Dodgeboy View Post
I re-read a description of the 9-speed's operation and it seems that 5th gear disengages the dog clutch, not engages it. For 5th, the dog clutch disengages and one of the regular wet-plate clutch packs engages.
That's correct. There are two dog clutches: A & F. Most of the discussions on this forum focus on the F clutch which needs to be engaged to accomplish gears 1, 2, 3, and 4, as well as Neutral/Park and Reverse. It is disengaged for all other gears. Some of the discussions are about downshifting where the F dog clutch is engaged going from 5th gear to 4th gear, and the accompanied rev match to line the gears up before the shift. The transmission does not need to shift through the gears sequentially so diving from 8th gear to 4th gear under acceleration (~passing gear) must accomplish 2 dog clutch shifts.

The A dog clutch needs to be engaged to accomplish gears 1, 2, 3, 4, 5, 6, and 7. It is disengaged for all other gears.

Recall R01 included the following table on page 9: http://www.wk2jeeps.com/Misc/Cheroke...RC_R01_15a.pdf...

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John D. Kelly proved these clutch scenarios in this video published back in September, 2015:
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Last edited by Array; 12-03-2016 at 01:47 AM.
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post #18 of 27 (permalink) Old 01-11-2017, 11:59 AM
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Im having this same issue between 4th and 5th gear, Ill feel a hard SLAM into gear. Caught me off guard the first few times. It has begun to do it more frequently (maybe 3 times a week) but it still does not do it enough to bring it to the dealer. I don't want to go to the dealer to just be told "we cant recreate the issue". My latitude V6 has 26,000 miles on it.
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post #19 of 27 (permalink) Old 01-11-2017, 05:29 PM
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Quote:
Originally Posted by Array View Post
That's correct. There are two dog clutches: A & F. Most of the discussions on this forum focus on the F clutch which needs to be engaged to accomplish gears 1, 2, 3, and 4, as well as Neutral/Park and Reverse. It is disengaged for all other gears. Some of the discussions are about downshifting where the F dog clutch is engaged going from 5th gear to 4th gear, and the accompanied rev match to line the gears up before the shift. The transmission does not need to shift through the gears sequentially so diving from 8th gear to 4th gear under acceleration (~passing gear) must accomplish 2 dog clutch shifts.

The A dog clutch needs to be engaged to accomplish gears 1, 2, 3, 4, 5, 6, and 7. It is disengaged for all other gears.

Recall R01 included the following table on page 9: http://www.wk2jeeps.com/Misc/Cheroke...RC_R01_15a.pdf...

Attachment 143345

John D. Kelly proved these clutch scenarios in this video published back in September, 2015: https://www.youtube.com/watch?v=A1U8hSIYa_c
Did not watch the video, but based on what you're saying, does that invalidate what the guy says in this video?


Basically, he says the dog clutch is used when changing from 4th to 5th gear, and 7th and 8th gear, which makes sense given what I've experienced downshifting from 8th to 7th, and 5th to 4th with the rev-match aspect of it like you would in a old-fashioned manual. All the other gears I've noticed are more traditional in their operation, which seemed to confirm what the guy in the video I posted said.

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post #20 of 27 (permalink) Old 01-11-2017, 06:50 PM
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Originally Posted by Shoulder View Post
.... but based on what you're saying, does that invalidate what the guy says in this video?
No. If you read a conflict between what I said and the guy's video, I probably worded something confusingly. I thought the guy's video was very good.

Another thought: The way you said "the dog clutch is used when changing from 4th to 5th gear, and 7th and 8th gear", you may be thinking the dog clutches (there are two of them) are only used to accomplish the shift. Actually the dog clutches stay engaged through a number of gears as shown by the 'X' marks in the chart I posted. This 9-speed transmission has 4 planetary gear sets and often times multiple clutches must remain engaged to get the gear ratios desired. The video by John D. Kelly I posted makes this very clear.
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Last edited by Array; 01-11-2017 at 07:04 PM.
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