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Old 09-29-2014, 02:06 PM
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9 speed transmission?

I have about 3500 miles on my Cherokee and I was cruising down the freeway at 75-80 miles per hour and I accidentally moved the shift lever to manual mode and transmission indicator lit up '8'. Moved the lever down to '9' and no change - no tach fluctuation. Is this normal? Why have a 9 speed when only 8 gears are used? Mine also shudders at about 14 mph on an easy acceleration. My thinking is that the tranny is in the wrong gear at 14 mph?

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Old 09-29-2014, 02:53 PM
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Re: 9 speed transmission?

A couple of times I've read that you'd have to be doing somewhere over 80 to keep the engine speed in the proper range in 9th gear on the Cherokee.

As for why they'd give you a high gear you can't use, it's probably a combination of marketing (9 speeds is more than 8 speeds) and standardized parts across all markets (some parts of the world have roads where higher speeds are safe).
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Old 09-29-2014, 03:00 PM
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Re: 9 speed transmission?

Mine went into 9th gear 2 times by its self going down hill at 80mph. I moved the lever from drive to manual mode and it said 9th and moved it back to auto mode and then back to manual mode it still said 9th so i moved it to 8th and the rpm did go up so i knew it was in 9th. Now today on level ground i was at 82mph i moved it into manual mode and it said 9th so i moved it to 8th and the rpm did go up so i guess it will do it by its self when it wants to lol.
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Old 09-29-2014, 03:05 PM
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Re: 9 speed transmission?

Didn't the Jeep 6 speed that was used through MY13 only used five of them, sometimes substituting one for another in the sequence?


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Old 09-29-2014, 03:24 PM
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Re: 9 speed transmission?

Quote:
Originally Posted by blk14altitude View Post
I have about 3500 miles on my Cherokee and I was cruising down the freeway at 75-80 miles per hour and I accidentally moved the shift lever to manual mode and transmission indicator lit up '8'. Moved the lever down to '9' and no change - no tach fluctuation. Is this normal? Why have a 9 speed when only 8 gears are used? Mine also shudders at about 14 mph on an easy acceleration. My thinking is that the tranny is in the wrong gear at 14 mph?
Most folks talk about getting 9th from 75+ going downhill or with a stiff tailwind. Others are saying 9 is showing up more as they put more miles on the vehicle.
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Old 09-29-2014, 03:56 PM
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Re: 9 speed transmission?

Hi there,

Based on my understanding, the manual mode of the tranny works differently when compared to what we have been used to; instead of juggling the shifter up & down as we please, the driver pre-programs the highest/top gear that you will be using. When test-driving, I was able to replicate that. So in this sense, it's not a genuinely manual mode, rather a mode that allows you to control the dynamics of your drives.

In terms of the automatic mode, the last three gears are considered overdrive gears, thus are not guaranteed to display in the sequence.
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Old 09-29-2014, 04:59 PM
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Re: 9 speed transmission?

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Originally Posted by sterno View Post
A couple of times I've read that you'd have to be doing somewhere over 80 to keep the engine speed in the proper range in 9th gear on the Cherokee.

As for why they'd give you a high gear you can't use, it's probably a combination of marketing (9 speeds is more than 8 speeds) and standardized parts across all markets (some parts of the world have roads where higher speeds are safe).
Maybe they should tie the 9th gear to the GPS, so it is only enabled in Montana or Nevada, but not on freeways.

Too bad they don't drop the axle ratios a bit to enable 9th in the 70-90 mph range and give a bit more grunt at the low end.

Stick around for the 2016 Cherokee Spinal Tap model, with 11 speed automatic.
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Old 09-29-2014, 05:27 PM
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Re: 9 speed transmission?

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Originally Posted by lstowell View Post
Maybe they should tie the 9th gear to the GPS, so it is only enabled in Montana or Nevada, but not on freeways.

Too bad they don't drop the axle ratios a bit to enable 9th in the 70-90 mph range and give a bit more grunt at the low end.

Stick around for the 2016 Cherokee Spinal Tap model, with 11 speed automatic.
It seems the magic rpm numbers they dont want you going under is 1500 in any over drive gears.
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Old 09-30-2014, 11:55 AM
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Re: 9 speed transmission?

I also noticed something weird going down a hill doing 35 mph, the tranny downshifted and the tach went up to almost 3500 rpm until I hit the bottom of the hill and then it upshifted and the tach went back down.
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Old 09-30-2014, 01:56 PM
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Quote:
Originally Posted by blk14altitude View Post
I also noticed something weird going down a hill doing 35 mph, the tranny downshifted and the tach went up to almost 3500 rpm until I hit the bottom of the hill and then it upshifted and the tach went back down.
Rev match.
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Old 10-03-2014, 09:56 PM
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Re: 9 speed transmission?

I have about 8200 miles on my Trailhawk. I have been everywhere between 75mph and 95mph. I have yet to see this thing go into 9th gear. Even going downhill at those speeds, it never gets above 8th. Even getting into 8th can be elusive. It's irritating cuz that's where the best mpg's are. Still have rough shifts from 1st into 2nd and 2nd into 3rd too. I'm not a fan of this tranny, and I especially hate that it's not an automatic manual like I had in my '13 Dodge Dart.
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Old 10-04-2014, 10:40 AM
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Re: 9 speed transmission?

Quote:
Originally Posted by Darkhawk View Post
I have about 8200 miles on my Trailhawk. I have been everywhere between 75mph and 95mph. I have yet to see this thing go into 9th gear. Even going downhill at those speeds, it never gets above 8th. Even getting into 8th can be elusive. It's irritating cuz that's where the best mpg's are. Still have rough shifts from 1st into 2nd and 2nd into 3rd too. I'm not a fan of this tranny, and I especially hate that it's not an automatic manual like I had in my '13 Dodge Dart.
My TH is a Jan 2014 build, 3.2L and I had similar issues. This week, the dealer "updated TCM per RRT# 14 - 040. Performed drive adaptation relearn process for all clutches per TSB#21-013-13." We'll see how it sorts out with more miles to complete the relearn process.

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