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  #61  
Old 12-10-2014, 08:41 AM
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Re: 9 speed transmission?

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Originally Posted by Desert Hiker View Post
My understanding is that the Manual + does not force an upshift - it merely sets the upper limit. The transmission is still the decider and will automatically select a lower gear if appropriate. So again, my guess is scapegoating.

Desert Hiker
You may very well be right! All I know is that until they come out with a sure-fire solution, I'll just leave mine in auto and only use the down shift when climbing a steep hill as we have here in Virginia.

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  #62  
Old 12-11-2014, 07:17 AM
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Re: 9 speed transmission?

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Originally Posted by Desert Hiker View Post
My understanding is that the Manual + does not force an upshift - it merely sets the upper limit permitting (not forcing) a higher gear. The transmission is still the decider and will automatically select a lower gear if appropriate. So again, my guess is scapegoating.

Desert Hiker

Correct. It isn't a true "manual" mode--it's an Electronic Range Select option. The transmission will still downshift if necessary. Regardless, selecting too high of a gear won't really stress the transmission--it's much more stress for the engine if anything.
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  #63  
Old 12-12-2014, 02:02 PM
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Re: 9 speed transmission?

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Originally Posted by Peter_K View Post
Correct. It isn't a true "manual" mode--it's an Electronic Range Select option. The transmission will still downshift if necessary. Regardless, selecting too high of a gear won't really stress the transmission--it's much more stress for the engine if anything.
That's right. ERS is NOT a manual mode. The Jeep Cherokee does NOT have a manual mode. The driver CANNOT force it into a higher gear than the vehicle's computer allows. The owners manual describes the purpose of ERS.
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  #64  
Old 01-19-2015, 05:44 PM
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Re: 9 speed transmission?

This break-in procedure crap is the most ridiculous thing I have read in a while. I broke in my wife's V6 TH per the manual and she doesn't get anywhere near 30mpg. In fact, after the dealer did the TSB tranny flash, it gets about 16mpg in the city.

If this transmission was truly that sensitive to how it is broken in, there would be a hell of a lot more reported problems.

I'm taking her TH in for the most recent flash. I am hopeful it will fix the rough shifting and crappy mpg.
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  #65  
Old 01-19-2015, 07:25 PM
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Re: 9 speed transmission?

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Originally Posted by hammick View Post
This break-in procedure crap is the most ridiculous thing I have read in a while. I broke in my wife's V6 TH per the manual and she doesn't get anywhere near 30mpg. In fact, after the dealer did the TSB tranny flash, it gets about 16mpg in the city.

If this transmission was truly that sensitive to how it is broken in, there would be a hell of a lot more reported problems.

I'm taking her TH in for the most recent flash. I am hopeful it will fix the rough shifting and crappy mpg.
MPG is very dependent on a lot of things, that is variables.
For me I was running around 19.0 in town. I do not have a lot of stop and go driving. That's a variable. The weather is a lot colder now and I am running -2 to 3 mpg under my warm weather driving. That is another variable.
I also use 89 octane, which I know is not suppose to have an effect on mpg but it seems to. Performance is better and that may effect mpg.
Also I did not even begin to see mpg improvement till I had between 2-3,000 miles. It was at that point it started using 8th on the hwy.
Its also not unusual to be in 7th doing 45 mph.
When when I am doing 1,100 rpm at 30-35 and 1700 at 65-70 that is mpg at work.
Break in is up to the owner. I take it seriously particularly with this 9 speed. I usually go beyond the minimum. What others think... well its their vehicles. But again that is my humble opinion.
It does seem to take AL thousands of miles to start using those gears properly.

The Trail Hawk is not EPA rated any where near 30 on the highway.
Some have said the flashes have helped the MPG. So the gearing is part of the break in right along with the AL which will ultimately determine the gears being used.
Just watch the rpm's and flip your stick over to see what gear you are using. Do this especially on the hwy. If you are using 8th over 65 mph them you are getting there.
Good luck and be patient.
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  #66  
Old 01-21-2015, 08:25 AM
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Re: 9 speed transmission?

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Originally Posted by hammick View Post
............

I broke in my wife's V6 TH per the manual and she doesn't get anywhere near 30mpg.

....................
Good Luck with that expectation!!!! V-6 TrailHawk? You bought the wrong vehicle if you expect 30 MPGs.

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  #67  
Old 01-22-2015, 04:36 AM
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Re: 9 speed transmission?

I don't really care whether the transmission engages 9th gear or not. All I care about are that the up and down shifts are smooth; which they are

PS: We adhered to the Break-in Period as per the instructions in the Manual. We have no mechanical issues, or any other issues for that matter
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  #68  
Old 05-13-2015, 08:55 PM
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9 speed transmission?

Comments on three topics in this thread:

* 9th gear: We did have my wife's Trailhawk with the V-6 go into 9th gear a couple of times on a road trip at high speed (freeway in the desert). But around home in a metropolitan area it mostly stays in 7th, and occasionally 8th when driving faster in rural areas. 9th is mostly unreachable. Note that the CEO of ZF says 9 gears is optimal for passenger vehicles.

* MPG: Don't buy a Jeep or 4WD and expect good miles per gallon!

* TSBs: Waited out the numerous transmission re-programming iterations until things settled. With her 8000-mile service we had RRT 14-040 flashed, and the smoothness is much improved! Her transmission wasn't that bad so we were able to wait, and this is a worthwhile service.
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  #69  
Old 05-14-2015, 07:40 AM
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Re: 9 speed transmission?

Quote:
Originally Posted by WK2 Rover View Post
* TSBs: Waited out the numerous transmission re-programming iterations until things settled. With her 8000-mile service we had RRT 14-040 flashed, and the smoothness is much improved! Her transmission wasn't that bad so we were able to wait, and this is a worthwhile service.
Is this another reflash? I just had RO1 done.
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  #70  
Old 05-15-2015, 10:42 AM
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Re: 9 speed transmission?

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Originally Posted by blk14altitude View Post
Is this another reflash? I just had RO1 done.
If you have the V6 motor this is what i had done and mine was a late build.
RO1 recall for tranny (mission and powertrain control modules.
2 - Reflash for (TCM).
3 - Reflash for (BCM).
4 - Reflash for (IPC).
5 - Reflash for (PCM)
6 - Reflash for (RDM)
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  #71  
Old 05-15-2015, 12:38 PM
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Re: 9 speed transmission?

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Originally Posted by jim383 View Post
If you have the V6 motor this is what i had done and mine was a late build.
RO1 recall for tranny (mission and powertrain control modules.
2 - Reflash for (TCM).
3 - Reflash for (BCM).
4 - Reflash for (IPC).
5 - Reflash for (PCM)
6 - Reflash for (RDM)
ROFLOL, and you guys can't figure out why you are having problems with the Cherokee 9 speed after 6 flashes or more? Quit playing around with it!!! My 2014 Cherokee 3.2L is a November 2013 custom order build. I have never had done any of the flashes/TSBs/recalls to it and it works and runs just fine. My advice is leave it alone. Best advice my dealer gave me when I picked it up was to drive it as hard as I normally drive vehicles. That seems to have been good advice as my Jeep is about a year and a half old now and I have had no problems.
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Old 05-15-2015, 04:11 PM
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Re: 9 speed transmission?

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Originally Posted by macfan View Post
ROFLOL, and you guys can't figure out why you are having problems with the Cherokee 9 speed after 6 flashes or more? Quit playing around with it!!! My 2014 Cherokee 3.2L is a November 2013 custom order build. I have never had done any of the flashes/TSBs/recalls to it and it works and runs just fine. My advice is leave it alone. Best advice my dealer gave me when I picked it up was to drive it as hard as I normally drive vehicles. That seems to have been good advice as my Jeep is about a year and a half old now and I have had no problems.
The only thing i wanted done was the snap ring R/CALL but they ran my vin and all that other crap came up so they flashed them. I told jeep at the factory if this next thing there going to do doesnt fix the down shiting problem then im going lemon law and see what happens. As far as driving it hard thats easy for me to do lol as i drive it like my 2 srt8s i had.
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