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  #205  
Old 02-22-2014, 09:46 AM
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Quote:
Originally Posted by Milous View Post
ALWAYS use your parking brake!!!
Uh ok because that's a Grand Cherokee?
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  #206  
Old 02-23-2014, 07:53 AM
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Originally Posted by overlanding View Post
Uh ok because that's a Grand Cherokee?
I hope so.
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  #207  
Old 03-09-2014, 12:14 PM
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Re: Holy smacks! My JGC just moved itself out of the driveway

Well it snowed again last week and I was able to get my JGC to replicate the rolling while in park scenario again and again.

This time I've recorded it while it happened and also had my wife do it from the outside so you could see what the wheels are doing when it's rolling. I believe that user tomk nailed it in this other thread:

2014 Jeep grand cherokee summit rolls in park

It would seem the video confirms that the open differential allows the Jeep to roll when one wheel does not have traction. It shows the rear tire spinning forward while the front one rolls backward. Dealer was still amazed when I showed them the video. "Crazy" seemed to be the predominant term from sales to finance to service.

So here's the videos:





Incidentally, I got rid of my 2014 JGC on Wednesday.

I traded it on a 2014 JGC CRD. ;-)

I bet it rolls in park, too.
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  #208  
Old 03-09-2014, 01:00 PM
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Yeah, you're definitely sliding in those videos, not "rolling" so to speak.
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  #209  
Old 03-09-2014, 01:14 PM
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Looked like back tire was sliding, really turned the opposite direction a little bit, but the fronts looked like they were rolling freely. I wonder if you park it while in 4 lo would hold the front axle too?
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  #210  
Old 03-09-2014, 02:50 PM
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Originally Posted by Kjens2004 View Post
Looked like back tire was sliding, really turned the opposite direction a little bit, but the fronts looked like they were rolling freely. I wonder if you park it while in 4 lo would hold the front axle too?
The fronts will never be held. The transfer case uses an electronically modulated wet clutch pack which I believe is disengaged when the vehicle is off. I don't believe 4Lo locks the front and rear together by default.
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  #211  
Old 03-09-2014, 02:57 PM
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In 4 hi I know its all electronic. I was just remembering a post from the thread about being stuck in sand when 4x4 malfunction. Some one posted that even with the evic showing the error, because the transfer case locks in low range he still had 4 wheel drive when he went to low range. I know this is different cause the jeep is not running. Just a thought.
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  #212  
Old 03-09-2014, 08:06 PM
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Re: Holy smacks! My JGC just moved itself out of the driveway

Its definitely sliding down the driveway, not rolling. I think it would probably do that even with your parking brake applied. You can see the rear wheel staying stationary mostly, and out the door in your first video you can see it on the other side as well. The service brake holds all 4 wheels, but the parking brake doesn't.

Thats just a weird combination of your driveway, and snow, and the Jeep.

As Peter said, the fronts will always rolls freely. All the parking pawl does is stop the drivetrain from rotating. Wheels not connected to the drivetrain will roll.
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  #213  
Old 03-09-2014, 08:15 PM
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I understand at least partially here. But it did not slide at all when my foot was pressing the footbrake or when I engaged the parking brake.

Quote:
Originally Posted by SW03ES View Post
Its definitely sliding down the driveway, not rolling. I think it would probably do that even with your parking brake applied. You can see the rear wheel staying stationary mostly, and out the door in your first video you can see it on the other side as well. The service brake holds all 4 wheels, but the parking brake doesn't. Thats just a weird combination of your driveway, and snow, and the Jeep. As Peter said, the fronts will always rolls freely. All the parking pawl does is stop the drivetrain from rotating. Wheels not connected to the drivetrain will roll.
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  #214  
Old 03-09-2014, 08:54 PM
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Re: Holy smacks! My JGC just moved itself out of the driveway

Quote:
Originally Posted by GoHerd View Post
I understand at least partially here. But it did not slide at all when my foot was pressing the footbrake or when I engaged the parking brake.
Thats why you should always use the parking brake

Its not the car's fault that it slides down an ice/snow covered driveway.
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  #215  
Old 03-09-2014, 09:10 PM
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Quote:
Originally Posted by SW03ES View Post
Thats why you should always use the parking brake Its not the car's fault that it slides down an ice/snow covered driveway.
My Jetta didn't do it. Dealer also was puzzled.
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  #216  
Old 03-09-2014, 09:14 PM
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Originally Posted by GoHerd View Post
My Jetta didn't do it. Dealer also was puzzled.
BIG weight difference. Heavier vehicles will tend to form a water sheet with re-freezing directly under the tires. The pressure differential alone can create this effect. Plus, with a heavier vehicle you have more rearward pressure on the slope as well.

This really looks like a combination of:

1) front wheels free to turn

2) parking pawl is locking the transmission, and thus the rear driveline

3) rear differential is open. Look at the exterior video--one rear wheel tries to go FORWARD as well as sliding. This is exactly how an open diff with a locked driveline will behave when the other wheel tries to move in the reverse direction.

The parking pawl seems to be working.
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