9th Gear on 2017 V-6's? - Page 3 - 2014+ Jeep Cherokee Forums
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post #21 of 38 (permalink) Old 05-19-2017, 12:38 PM
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Originally Posted by edge600 View Post
So no need to swap transmissions just the front and rear PTU's? That gives me more hope about it's possibly.
Actually there is only one PTU (Power Transfer Unit) on the KL 4x4 and power flows from the transmission through that PTU to the front differential. When 4x4 is engaged, a dog clutch or sleeve (depending on whether it's an AD1 or the others) connects the PTU to the prop shaft so power also flows to the rear differential which is referred to as the RDM (Rear Drive Module).

I guessing the modification would be easier than messing with the PTU. The planetary gear set in the front differential and the rear differential would be replaced to change the ratio to the wheels. But they both have to be changed otherwise it would break. This guess provided by a rusty 1960's backyard mechanic .

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post #22 of 38 (permalink) Old 05-19-2017, 12:45 PM
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Originally Posted by HawkeyeKL View Post
These Transmissions are made in Germany. I don't think they have a problem getting up to 9th gear speed legally. That is the problem. Not designed with US highway laws in mind.
ZF does make 9-speed transmissions in Germany. However, I understand that the 9-speed transmissions used in US-built vehicles are built by Chrysler in Indiana, under license from ZF.


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post #23 of 38 (permalink) Old 05-19-2017, 12:54 PM
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Originally Posted by Array View Post
Actually there is only one PTU (Power Transfer Unit) on the KL 4x4 and power flows from the transmission through that PTU to the front differential. When 4x4 is engaged, a dog clutch or sleeve (depending on whether it's an AD1 or the others) connects the PTU to the prop shaft so power also flows to the rear differential which is referred to as the RDM (Rear Drive Module).

I guessing the modification would be easier than messing with the PTU. The planetary gear set in the front differential and the rear differential would be replaced to change the ratio to the wheels. But they both have to be changed otherwise it would break. This guess provided by a rusty 1960's backyard mechanic .
I've already replaced what the service manual calls the rear PTU due to a seized pinion (had to remove rear drive shaft and rear CV's just to get it off the BOH trail I was doing) and was told the entire unit had to be replace because it isn't serviceable. I didn't ask questions because they replaced it under warranty.
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post #24 of 38 (permalink) Old 05-19-2017, 07:54 PM
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Originally Posted by edge600 View Post
I've already replaced what the service manual calls the rear PTU due to a seized pinion (had to remove rear drive shaft and rear CV's just to get it off the BOH trail I was doing) and was told the entire unit had to be replace because it isn't serviceable. I didn't ask questions because they replaced it under warranty.
Hmmm.

The service manual I have says the PTU is bolted to the engine and transaxle:

13. Remove the bolts holding the PTU support bracket to the engine block and the oil pan.
14. Separate the PTU support bracket from the PTU.
15. Remove the bolts holding the PTU to the transaxle.


The service manual refers to the rear components as the RDM (Rear Drive Module) which generally includes the TTD (Torque Transfer Device) and the rear differential:

3. Remove the muffler.
...
8. Remove the bolts holding the rear propeller shaft to the rear pinion flange.
...
12. Remove the left rear knuckle.
13. Remove the left axle shaft from the Rear drive Module.
14. Support the Rear Drive Module with a suitable jack and secure it with chains.
15. Remove the rear mount bolt from the Rear Drive Module.
16. Remove the front mount bolts from the Rear Drive Module.
17. Lower the Rear Drive Module with the right axle shaft attached to the Rear Drive Module.


Here is an American Axle video saying the same about their Eco Trac system which is the system used in the KL 4x4:
.

Here's a video of Jeep's Mitch Clauw describing the PTU:
.

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post #25 of 38 (permalink) Old 05-20-2017, 09:08 AM
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I like the 9th gear and figure it is just right for rpm when coming out of 8th. The next step is to get a 10th gear for doing 100.
In general I figure it's a pretty smart system if I want to gear down when slowing down I just give the gas pedal a quick punch when using auto mode works great even in lower gears going from 3<2<1. secondly if I want complete control I use manual mode which is idiot proof and works great, I quest that's why that option is their. And works even better when you can use it without looking which way to push the lever - or + all you remember is - foreword + back. When you don't have to sneak a peak you have it mastered. Remember when manuals where a given for off-roading for speed control and in the city, sure saves the break pads and rotors


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post #26 of 38 (permalink) Old 05-20-2017, 09:40 AM
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Originally Posted by AlbertaCherokee View Post
I like the 9th gear and figure it is just right for rpm when coming out of 8th. The next step is to get a 10th gear for doing 100.
In general I figure it's a pretty smart system if I want to gear down when slowing down I just give the gas pedal a quick punch when using auto mode works great even in lower gears going from 3<2<1. secondly if I want complete control I use manual mode which is idiot proof and works great, I quest that's why that option is their. And works even better when you can use it without looking which way to push the lever - or + all you remember is - foreword + back. When you don't have to sneak a peak you have it mastered. Remember when manuals where a given for off-roading for speed control and in the city, sure saves the break pads and rotors


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But the Cherokee doesn't have a "manual" mode. It has ERS[electronic range selection].
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post #27 of 38 (permalink) Old 05-20-2017, 10:18 AM
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Originally Posted by mmahamm View Post
ZF does make 9-speed transmissions in Germany. However, I understand that the 9-speed transmissions used in US-built vehicles are built by Chrysler in Indiana, under license from ZF.
It never ceases to amaze me how members on this forum jump on a thread, without reading the previous threads. Case in point: Post #26 on Page 2.

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post #28 of 38 (permalink) Old 05-20-2017, 11:33 AM
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"I was politely corrected for recently saying the FCA tranny plant was in Indianapolis... I'm a Canuck, and I Googled the plant and it said 100 miles from Indianapolis, so... well... 100 miles for me is a short distance so I said Indianapolis. I love the 500, been watchihg it on TV since I was a kid lol." Mark------Closer this time--but Kokomo is only about 55 miles or so from Indianapolis--I was born and raised in the Kokomo,Indiana area so I used to make that run when I was a young man living there--now an old man living in SC. So it is really short for you--I think the 9 speeds are actually made in Tipton, Indiana which is still about 7 or 8 miles closer to Indy.

NOW TO THE POINT OF THIS THREAD--My 2017 TH with the tow package goes into 8th gear between 52 and 57 mph on a flat service. You would think I would see 9th, but haven't yet at speeds up to about 80 mph

The Latitude without the tow package does about the same thing---but will double check since the final ratio is different as I don't have the tow package on the Latitude--maybe it doesn't go into 8th at that low speed.

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post #29 of 38 (permalink) Old 05-20-2017, 11:47 AM
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Originally Posted by ptram View Post
"I was politely corrected for recently saying the FCA tranny plant was in Indianapolis... I'm a Canuck, and I Googled the plant and it said 100 miles from Indianapolis, so... well... 100 miles for me is a short distance so I said Indianapolis. I love the 500, been watchihg it on TV since I was a kid lol." Mark------Closer this time--but Kokomo is only about 55 miles or so from Indianapolis--I was born and raised in the Kokomo,Indiana area so I used to make that run when I was a young man living there--now an old man living in SC. So it is really short for you--I think the 9 speeds are actually made in Tipton, Indiana which is still about 7 or 8 miles closer to Indy.

NOW TO THE POINT OF THIS THREAD--My 2017 TH with the tow package goes into 8th gear between 52 and 57 mph on a flat service. You would think I would see 9th, but haven't yet at speeds up to about 80 mph

The Latitude without the tow package does about the same thing---but will double check since the final ratio is different as I don't have the tow package on the Latitude--maybe it doesn't go into 8th at that low speed.
Lol. Ok-ok... I'll stop saying Indianapolis from now on...

My 2015 MY with Tow group will not *normally* hit 8th gear below 57mph, so it seems they've tweaked the programming on 2017s, which is good.
About 9th on your 2017s : while the engine load increases as you pick up speed, they may have decided the 3.2 just wouldn't perform well in 9th, so they didin't encourage it with new programming. Just guessing here.

As far as your Tow vs non Tow 2017s and 8th gear goes : apples and oranges in your case because you have a TH and a non TH, with different engine loads at highway speeds (aerodynamics + weight).

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post #30 of 38 (permalink) Old 05-20-2017, 11:56 AM
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"As far as your Tow vs non Tow 2017s and 8th gear goes : apples and oranges in your case because you have a TH and a non TH, with different engine loads at highway speeds (aerodynamics + weight)."


According to my SC titles the weight of the TH is 4028 and the Latitude is 3953, but that is what the state of SC says they weigh--so may not be correct.

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