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  #217  
Old 03-09-2014, 09:25 PM
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Re: Holy smacks! My JGC just moved itself out of the driveway

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Originally Posted by GoHerd View Post
My Jetta didn't do it. Dealer also was puzzled.
Exactly...your Jetta doesn't weigh 5,000 lbs lol. IMHO thats like saying "my Jetta didn't roll over when I took that offramp at 80MPH, the Jeep is defective!" Its not defective, just different. This is one of those things you have to be more cognizant of when driving a heavy vehicle like this...its not a Jetta.

If anything I think the issue here is that when the vehicle rests back on the parking pawl, it creates enough momentum to get it sliding on the icy driveway. When your foot is on the brake or when you engage the parking brake before you release the service brakes that settling motion back on the parking pawl doesn't occur, thus the Jeep doesn't slide down the driveway. Thats not to say if you gave it a good shove and broke the surface tension it wouldn't...it might...

BUT...you said it yourself. It doesn't happen when you use the parking brake...so use the parking brake. Short of installing an anchor there isn't anything they can do to "fix" this. Its physics.
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  #218  
Old 03-10-2014, 01:32 AM
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Re: Holy smacks! My JGC just moved itself out of the driveway

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Originally Posted by SW03ES View Post
If anything I think the issue here is that when the vehicle rests back on the parking pawl, it creates enough momentum to get it sliding on the icy driveway. When your foot is on the brake or when you engage the parking brake before you release the service brakes that settling motion back on the parking pawl doesn't occur, thus the Jeep doesn't slide down the driveway. .
Here is a test to do. Do NOT engage the park brake, release foot off the brake as per video, then engage it again when vehicle starts to move.
Does it continue to slide? If so then you clearly have the situation that has been suggested, the slight rearward movement when moving to park without the park brake is enough to cause the slide.
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  #219  
Old 03-10-2014, 01:49 AM
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Re: Holy smacks! My JGC just moved itself out of the driveway

I blame the Forteras a little too. I was sliding down a hill (going forward) while driving with brakes applied (which was scary), and only could stop from sliding by turning the wheels left and right while braking.
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  #220  
Old 03-10-2014, 07:55 PM
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Quote:
Originally Posted by SW03ES View Post
Exactly...your Jetta doesn't weigh 5,000 lbs lol. IMHO thats like saying "my Jetta didn't roll over when I took that offramp at 80MPH, the Jeep is defective!" Its not defective, just different. This is one of those things you have to be more cognizant of when driving a heavy vehicle like this...its not a Jetta. If anything I think the issue here is that when the vehicle rests back on the parking pawl, it creates enough momentum to get it sliding on the icy driveway. When your foot is on the brake or when you engage the parking brake before you release the service brakes that settling motion back on the parking pawl doesn't occur, thus the Jeep doesn't slide down the driveway. Thats not to say if you gave it a good shove and broke the surface tension it wouldn't...it might... BUT...you said it yourself. It doesn't happen when you use the parking brake...so use the parking brake. Short of installing an anchor there isn't anything they can do to "fix" this. Its physics.
Quit patronizing me. I know there's a huge weight difference with the Jetta and they are not the same vehicles. I've owned this and seven other heavy SUVs from Jeeps to Pilots to 4Runners since 1995. I know it was snowy but it wasn't that slick and it wasn't that steep. Just believe very strongly this is not a behavior drivers would expect or is the norm for other vehicles regardless of size.

The dealer didn't believe it was acceptable either. Also note that the first time it did this, it rolled into the roadway about a half hour after I had parked it. That may be as one poster said due to heat from the tires.

I like so many others here have grown tired with the lectures about using the parking brake. I'd proffer that I'm more diligent about using it than 95 percent of Americans as all but the last four of my cars were standard transmission.

Nevertheless I again return to my original post -- seeking others who have had this happen and answers. I appreciate those who have explained how the differential is working.

Perhaps we've enlightened all JGC owners about its behavior in spite of the parking brake truthers.
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  #221  
Old 03-10-2014, 08:41 PM
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Re: Holy smacks! My JGC just moved itself out of the driveway

There is nothing wrong with the Jeep. What video shows is physics. My Ford E250 company truck does the same thing on my snow/ice covered downhill driveway. With open differential one tire spins opposite to the other so only ONE tire actually keeps the vehicle from rolling downhill. If the tire that supposed to spin up-hill does not have traction and slide the other tire just spin free downhill and the truck start to roll. Use parking brake, you have paid for it, so use it.
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  #222  
Old 03-10-2014, 08:59 PM
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Re: Holy smacks! My JGC just moved itself out of the driveway

I must admit to being amazed that people don't use the parking brake. The fact that you can now put it one while your free hand under your seat beat means it really doesn't take any extra time.

I think my uncle hit me around the head a few times when I used his XJ-12 many, many moons ago and just put it into park without applying the hand brake. He went on about 'you want to stuff up my trans bro...' or something like that.

Long story short, for extra piece of mind make your seat belt and parking brake the first and last thing when you get into your Jeep.

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  #223  
Old 03-10-2014, 09:51 PM
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Quote:
Originally Posted by dsi jeep View Post
There is nothing wrong with the Jeep. What video shows is physics. My Ford E250 company truck does the same thing on my snow/ice covered downhill driveway. With open differential one tire spins opposite to the other so only ONE tire actually keeps the vehicle from rolling downhill. If the tire that supposed to spin up-hill does not have traction and slide the other tire just spin free downhill and the truck start to roll. Use parking brake, you have paid for it, so use it.
Best illustration of what happened yet. Thank you.
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  #224  
Old 03-11-2014, 02:29 PM
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Re: Holy smacks! My JGC just moved itself out of the driveway

Quote:
Originally Posted by GoHerd View Post
Quit patronizing me. I know there's a huge weight difference with the Jetta and they are not the same vehicles. I've owned this and seven other heavy SUVs from Jeeps to Pilots to 4Runners since 1995. I know it was snowy but it wasn't that slick and it wasn't that steep. Just believe very strongly this is not a behavior drivers would expect or is the norm for other vehicles regardless of size.
If at this point you still refuse to use the parking brake even though you acknowledge it doesn't do it with the brake engaged, you deserve to be patronized I'm sorry. Your Jeep is SLIDING DOWN THE ICY DRIVEWAY. Its a matter of physics, not of equipment. You're the one who brought up your Jetta not doing it as evidence that your Jeep should not do it...not me.

Quote:
I like so many others here have grown tired with the lectures about using the parking brake. I'd proffer that I'm more diligent about using it than 95 percent of Americans as all but the last four of my cars were standard transmission.
I will not let up on it, if you care about safety more than just b!tching...the simple solution is to use the parking brake. You're the one who brought the topic back, not us.

Quote:
Best illustration of what happened yet. Thank you.
Then follow his advice or stop posting about it. Theres nothing Jeep can do to stop your vehicle from sliding down your icy driveway. As dsi and others have said, this is a matter of physics. The parking brake is there to help combat the forces of physics.
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  #225  
Old 03-11-2014, 05:00 PM
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Re: Holy smacks! My JGC just moved itself out of the driveway

On another forum I've seen a 'smiley' that shows someone beating a dead horse... we need one of those here.
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  #226  
Old 03-11-2014, 05:15 PM
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Re: Holy smacks! My JGC just moved itself out of the driveway

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Originally Posted by jgc4ever View Post
I blame the Forteras a little too. I was sliding down a hill (going forward) while driving with brakes applied (which was scary), and only could stop from sliding by turning the wheels left and right while braking.
Well, obviously it is your fault for NOT PUTTING ON THE PARKING BRAKE.
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  #227  
Old 03-11-2014, 05:20 PM
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Re: Holy smacks! My JGC just moved itself out of the driveway




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  #228  
Old 03-11-2014, 06:17 PM
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Re: Holy smacks! My JGC just moved itself out of the driveway

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