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  #13  
Old 10-03-2013, 09:01 PM
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Re: Is it possible to lock the center diff?

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Originally Posted by Scottina06 View Post
it all works the same as it did in 2011. They swapped to an 8 speed tranny...that's it
Well, the sand & mud setting are separated. So I'd say that unless Jeep is pulling one over on us, it's not the same exact way it has been all along. And besides, there is obviously a lot of confusion on this based on the answers so far. Some people say that the center diff only locks in 4L, and others say that it will lock in 4H in certain modes.

And to the guy that asked if I contacted Jeep-- no, that's why I'm asking here. The people that I've met at Jeep barely know anything about the products they sell. I had one guy tell me that QT1 is just as good as QDII. LOL
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Old 10-04-2013, 06:15 PM
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Re: Is it possible to lock the center diff?

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Originally Posted by MSCA View Post
And to the guy that asked if I contacted Jeep-- no, that's why I'm asking here. The people that I've met at Jeep barely know anything about the products they sell. I had one guy tell me that QT1 is just as good as QDII. LOL
Unfortunately, your problem isn't "can you lock the center diff", it's "can the Jeep get up your snowy hill". Your question is one of mechanism, but what you want is a specific result. Do you really care HOW the Jeep does it if, in fact, it can make it up your snowy hill?

There may well be a vehicle with a locking center diff that can't make it up your hill. It's the entire system, which perhaps a center locking diff is part of the solution, but also, perhaps, not necessarily the only solution, especially with modern drive trains.

Unfortunately, the only way to find out, regardless of how it is done (or not) is to try it out.

The center diff lock, I think, is simply a distraction from the problem at hand.
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Old 10-04-2013, 10:52 PM
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Re: Is it possible to lock the center diff?

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Originally Posted by whartung View Post
Unfortunately, your problem isn't "can you lock the center diff", it's "can the Jeep get up your snowy hill". Your question is one of mechanism, but what you want is a specific result. Do you really care HOW the Jeep does it if, in fact, it can make it up your snowy hill?

There may well be a vehicle with a locking center diff that can't make it up your hill. It's the entire system, which perhaps a center locking diff is part of the solution, but also, perhaps, not necessarily the only solution, especially with modern drive trains.

Unfortunately, the only way to find out, regardless of how it is done (or not) is to try it out.

The center diff lock, I think, is simply a distraction from the problem at hand.
Um, no. I'm specifically asking what modes (if any) will lock the center diff on the 2014 QTII system. My question has nothing to do with any particular hill. I just want to know and understand how the system operates in each terrain mode. Not sure why that's so difficult to understand...
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Old 10-04-2013, 11:05 PM
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Re: Is it possible to lock the center diff?

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Originally Posted by MSCA View Post
Um, no. I'm specifically asking what modes (if any) will lock the center diff on the 2014 QTII system. My question has nothing to do with any particular hill. I just want to know and understand how the system operates in each terrain mode. Not sure why that's so difficult to understand...
I'd like to know how it works too.

And no, the dealer doesn't have a clue.
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  #17  
Old 10-05-2013, 12:01 AM
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Re: Is it possible to lock the center diff?

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Originally Posted by MSCA View Post
Well, the sand & mud setting are separated. So I'd say that unless Jeep is pulling one over on us, it's not the same exact way it has been all along. And besides, there is obviously a lot of confusion on this based on the answers so far. Some people say that the center diff only locks in 4L, and others say that it will lock in 4H in certain modes.

And to the guy that asked if I contacted Jeep-- no, that's why I'm asking here. The people that I've met at Jeep barely know anything about the products they sell. I had one guy tell me that QT1 is just as good as QDII. LOL

ITS ALL THE SAME except sport was moved to the shifter and sand and mud were separated. The sport mode was moved to the shifter because of the paddles. That left a button open to separate sand/mud. ALL YOUR QUESTIONS ARE ANSWERED in the thread I linked. Its the exact same discussion. QT2 and QD2 still work the same....but are mated to a world class tranny. If your Toyota can make it up to the cabin...so can the GC.
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  #18  
Old 10-05-2013, 12:16 AM
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Re: Is it possible to lock the center diff?

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Originally Posted by Scottina06 View Post
ITS ALL THE SAME except sport was moved to the shifter and sand and mud were separated. .
So sand and mud were separated. Are you trying to tell me that those two modes operate exactly the same? If so, then why would they now be separated? Obviously they were the same before (when they were one mode), but now that they're separated, they MUST be different, unless of course Jeep is fooling us.
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Old 10-05-2013, 12:19 AM
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Re: Is it possible to lock the center diff?

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I'd like to know how it works too.

And no, the dealer doesn't have a clue.
Yup, instead of getting an actual answer, all I see here is mixed messages and people disagreeing. And of course other people who point to other threads/hyperlinks and simply say "you can find the answer there", when ironically, people disagree there too. It's just a shame that Jeep doesn't publish factual information regarding exactly what's going on with the 4wd system in each and every mode.
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Old 10-05-2013, 12:53 AM
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Re: Is it possible to lock the center diff?

it was posted in the other thread what each mode does......jeep has posted on various sites what each mode does. Not sure exactly what your looking for?

QT2 only locks in 4lo.....in 4hi it transfers up to 100% tq to any wheel...regardless of axle front to back.

qd2 has a rear elsd added to the qt2 4wd system
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  #21  
Old 10-05-2013, 12:53 AM
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Re: Is it possible to lock the center diff?

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  #22  
Old 10-05-2013, 01:03 AM
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Re: Is it possible to lock the center diff?

now for select terrain

auto-The system leaves the traction control system in nominal mode, 45% of the engine power is delivered to the front wheels and 55% is sent to the rear wheels and the Transmission behaves normally

snow-then the system puts a bit more power in the front wheels, starts the vehicle in 2nd gear and makes the traction control system more aggressive.

sport-80% of the power is delivered to the rear wheels (this is where you want power for racing...improves acceleration and handling). The traction control system is also turned off so that the driver is able to drift through corners. The shift points on the transmission are also tuned to be a bit stiffer. Finally, if the Grand Cherokee is also equipped with Quadra-lift then the Jeep will be lowered by about half an inch to improve aerodynamics

sand-same as snow except GC starts in 1st gear

mud-same as above but allows more driver intervention

rock- the 4 wheel drive system must be placed in low range. This is done by placing the transmission in neutral and pressing the 4wd Low button right next to the Selec Terrain switch. Once the Jeep is in low range, the switch can be turned to Rock and this mode is engaged. As before the traction control system is more aggressive. If the Grand Cherokee is equipped with the Quadra-lift system the Jeep is raised up to 4 inches giving a pretty good ground clearance.
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  #23  
Old 10-05-2013, 02:50 PM
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Re: Is it possible to lock the center diff?

I think the simple answer is that you cannot manually lock the WK2's QTII case into 4Hi like you could with some cases in previous years. Same with locking the ELSD. Selecting 4Lo does seem to lock the transfer case, however. But that is also under traction computer control, so Jeep could change that.

The computer uses a vehicle dynamics model and traction control algorithm to lock or partially lock the case in 4Hi under certain conditions. The result depends on which mode is selected, how much throttle is applied, and other conditions like wheel spin. For example, the ELSD is locked when the systems senses that you mash the throttle.

The traction control algorithm is Jeep proprietary and they are not going to answer specifically how it works (the best you get is what Scott described above). There have been several attempts to reverse engineer it here, and that has lead to many disagreements. Similar to the old multispeed auto discussions.

If you buy a WK2 you just have to trust the traction software... and the effectiveness reviews. Right or wrong, that's the way Jeep chose to do it. If you don't like it, buy some other dumber vehicle, one that gives the driver the ability to manually select. You can also try complaining .

The MP3023 QTII transfer case by other names is used in a number of other vehicles, including GM pickups. I think GM gives you more manual control, like 2Hi.

This article, that someone else mentioned here before in one of the driveline threads, has some info on the GM version, where they just use a switch, I think, to select 4Hi, 4Lo, 2Hi, auto.

http://www.ptcinc.ca/mrws/filedriver...sfer_Cases.pdf
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  #24  
Old 10-05-2013, 03:31 PM
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Re: Is it possible to lock the center diff?

So what is WK2's equivalent of GM's 4HI ?
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