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  #37  
Old 08-26-2015, 05:06 PM
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Re: roll away

If this is design flaw, they should be seeing the same issue and % in the lx cars since they used same trans and shifter.


I see yet another stupid interlock coming and we wonder why cars are so damn expensive and complex.


Mabye you will now have to set the e-brake before you can put it in park, before you can shut it off.

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  #38  
Old 08-26-2015, 06:18 PM
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Re: roll away

From the news report there are GCs that have rolled while in PARK with the engine running and with the engine off. With the engine running I can see it MAY be user error, they thought it was in PARK, but it wasn't, and they didn't apply the brake. But if the motor is off, then there shouldn't be anyway for it to roll. The motor shouldn't turn off unless it is in PARK.

I vaguely remember someone posting about 12 months ago that they parked their GC in the driveway, turned it off and went inside. Came outside later and the car had rolled into the street. I'll see if I can dig it up.
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  #39  
Old 08-26-2015, 06:28 PM
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Re: roll away

Found it:
Holy smacks! My JGC just moved itself out of the driveway

And another:
2014 Jeep grand cherokee summit rolls in park
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  #40  
Old 08-26-2015, 07:18 PM
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Re: roll away

Quote:
Originally Posted by Turbozcs2003 View Post
for folks who shut off engine while in park and it rolled, the pawl must be bad and a tear down of the trans can determine that.
Those threads I posted above occurred in icy conditions, the suggestion is that while in PARK the open diff allowed a wheel with low grip to rotate backwards, the other wheel turned forward, and the car rolled.

Solution is to use the park brake.
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  #41  
Old 08-26-2015, 09:04 PM
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Re: roll away

hmmm

Chrysler recalls AWD 300, Charger, Ram 1500 over ZF transmission
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  #42  
Old 08-26-2015, 09:17 PM
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roll away


Thats an interesting article and explains the roll away complaints.

I thought the 8 speed was the same across all platforms/models.


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  #43  
Old 08-26-2015, 10:06 PM
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Re: roll away

Quote:
Originally Posted by antsjeep View Post
Thats an interesting article and explains the roll away complaints.

I thought the 8 speed was the same across all platforms/models.


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There are some differences, that 300C/Charger/RAM1500 recall was for the 8HP45 transmissions, made by ZF. Chrysler do their own version of it for the 3.6l Grand Cherokee 845RE, it has some tweaks to improve fuel economy. Then the V8 and Diesel have the ZF built 8HP70.

I don't think its the same issue though here, there would be no drive if the output shaft was fractured.
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  #44  
Old 08-27-2015, 11:07 AM
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Re: roll away

My jeep came up to me today and apologized for rolling away, said he was going thru a phase. Then the lambo doors opened and the damn thing flew away
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  #45  
Old 08-27-2015, 12:04 PM
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Re: roll away

As one who was always taught to use the emergency brake when parked, I always shifted into neutral (AT Tranny), put on the e-brake and then shifted into park. That way the chassis settles and no chance that the vehicle weight will rest on the parking prawl.

Quote:
Originally Posted by BubbaATL View Post
I do if I'm sitting and waiting on someone with the motor running. When I park them, I park them in gear (first or reverse, depending on the slope) with the parking brake set.

When I park an auto tranny vehicle, I set the parking brake before releasing my foot from the brake, so the weight of the vehicle rests primarily on the brake rather than on the transmission. That's the way I've always done it, and the way I taught all my kids to do it.
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  #46  
Old 08-27-2015, 04:17 PM
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roll away

Anytime you park on an incline, you should first set the parking brake before you let the tranny hold it, just to save on wear and tear. At least do that.
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  #47  
Old 08-27-2015, 04:21 PM
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Re: roll away

I'm still getting used to the "ratcheting" shifter. After I engage it in Park, I wait several seconds just to make sure before shutting it down. It's not that I don't trust the car. I don't trust myself. The thing is a bit awkward.
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  #48  
Old 08-27-2015, 04:33 PM
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Re: roll away

Quote:
Originally Posted by antsjeep View Post
Thats an interesting article and explains the roll away complaints.

I thought the 8 speed was the same across all platforms/models.


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That model 8 speed isn't used in the GC, IIRC, on the V6?

It would be interesting that it would break an output shaft on light passenger vehicles, but not on an SUV that would be presumed to get heavier duty use.

One would expect that even the most non-sentient driver would be able to
detect a broken output shaft...
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