A new UConnect Update ? or Part of the Tranny Shift Lever Recall? - Page 2 - Jeep Garage - Jeep Forum

Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WK2 - > Audio/Visual/Navigation

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #13  
Old 10-09-2016, 09:01 AM
NetworkTV's Avatar
Member
My Jeep: 2015 3.6L WK2
 
Join Date: Apr 2015
Posts: 833
Thanks: 3
Thanked 191 Times in 144 Posts
Rep Power: 6970
NetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond repute
Re: A new UConnect Update ? or Part of the Tranny Shift Lever Recall?

Quote:
Originally Posted by f1anatic View Post
And slamming it into Park even at 1 - 1.5 mph is supposed to be safe for the transmission? I don't think any of us would do that intentionally...
It's not quite like that.

Modern transmissions can't actually be "slammed" into Park. There's essentially what amounts to a clutch that prevents it from being a hard shift into a non-moving gear. It's somewhat comparable to the clutch in a modern drill/driver that's designed to prevent stripping soft metal screws when too much resistance is achieved.


The computer knows whether the gears are turning or not, so it knows not to just jab it into a hard Park position when moving.

In other words, if you had it auto park at 1 mph, it would likely gently roll to a stop over a couple feet rather than a quick stop like an older transmission would produce.


It's actually been a couple decades since it was possible to lock things up by forcing it into Park while moving.

__________________
2015 Jeep Grand Cherokee Limited
Deep Cherry Red Crystal Pearl Coat

Reply With Quote
Sponsored Links
Advertisement
 
  #14  
Old 10-09-2016, 10:17 AM
f1anatic's Avatar
Premium Member
My Jeep: 2014 3.6L WK2
 
Join Date: Jan 2013
Location: Chicago, IL
Posts: 1,725
Thanks: 77
Thanked 208 Times in 150 Posts
Rep Power: 160017
f1anatic has a reputation beyond reputef1anatic has a reputation beyond reputef1anatic has a reputation beyond reputef1anatic has a reputation beyond reputef1anatic has a reputation beyond reputef1anatic has a reputation beyond reputef1anatic has a reputation beyond reputef1anatic has a reputation beyond reputef1anatic has a reputation beyond reputef1anatic has a reputation beyond reputef1anatic has a reputation beyond repute
Re: A new UConnect Update ? or Part of the Tranny Shift Lever Recall?

Quote:
Originally Posted by NetworkTV View Post
It's not quite like that.

Modern transmissions can't actually be "slammed" into Park. There's essentially what amounts to a clutch that prevents it from being a hard shift into a non-moving gear. It's somewhat comparable to the clutch in a modern drill/driver that's designed to prevent stripping soft metal screws when too much resistance is achieved.


The computer knows whether the gears are turning or not, so it knows not to just jab it into a hard Park position when moving.

In other words, if you had it auto park at 1 mph, it would likely gently roll to a stop over a couple feet rather than a quick stop like an older transmission would produce.


It's actually been a couple decades since it was possible to lock things up by forcing it into Park while moving.
Granted that not all transmissions are the same, read up on Parking Pawl. Then read on ZF's website as they reference the Parking Pawl in their modern shift-by-wire transmissions. Cars | Gearshift Systems - ZF Friedrichshafen AG

Finally, go ahead and do it with your Jeep. It is easier to trigger the new auto park feature if you are reversing with the door open and no seat belt. Share your experience afterwards, especially how quickly it engaged.
Reply With Quote
  #15  
Old 10-15-2016, 09:44 AM
NetworkTV's Avatar
Member
My Jeep: 2015 3.6L WK2
 
Join Date: Apr 2015
Posts: 833
Thanks: 3
Thanked 191 Times in 144 Posts
Rep Power: 6970
NetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond repute
Re: A new UConnect Update ? or Part of the Tranny Shift Lever Recall?

Quote:
Originally Posted by f1anatic View Post
Granted that not all transmissions are the same, read up on Parking Pawl. Then read on ZF's website as they reference the Parking Pawl in their modern shift-by-wire transmissions. Cars | Gearshift Systems - ZF Friedrichshafen AG

Finally, go ahead and do it with your Jeep. It is easier to trigger the new auto park feature if you are reversing with the door open and no seat belt. Share your experience afterwards, especially how quickly it engaged.
That's more or less what I was referring to. It's only going to lock in when the transmission is no longer in motion. Otherwise, it just skips.

However, I did notice this nugget on the second link:

Quote:
The excellent gearshift knob haptics are achieved via the patented locking system, which is free of play.
Yeah right...

That may describe the shift knob, but that doesn't describe my transmission. Mine has so much play, I've had times where I took my foot off the brake after shutting down and had the Jeep roll forward enough to alarm me that it might not stop. This is from a guy who came from a manual.

If there's one thing the 8 Speed transmission isn't, is free of play. It's got enough slop in it to make a sty full of pigs happy.
__________________
2015 Jeep Grand Cherokee Limited
Deep Cherry Red Crystal Pearl Coat

Reply With Quote
Reply

Tags
uconnect, update

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Shift Lever Override/Remote Start issue r063r Trouble Shooting/Problems/Service 3 11-18-2012 08:42 PM
Shift Lever Override - There is one! savvas Export Grand Cherokee 2011+ 3 09-07-2012 02:28 AM
Shift Lever Override on RHD export WK2 GC's savvas Tech Tips/DIY/How To 0 09-07-2012 01:02 AM
Shift Lever Steve52 Suspension/Driveline/Brakes/Wheels/Tires 21 08-29-2010 12:04 PM
88 wagoneer shift lever wont move shooterwood Troubleshooting/Problems Discussion 1 06-18-2010 10:18 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 01:48 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by FCA US LLC. Chrysler, Dodge, Jeep, Ram, Mopar and SRT are registered trademarks of FCA US LLC.