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  #21  
Old 11-27-2013, 09:00 AM
Asur Asur is offline
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Originally Posted by Explorer Rob View Post
While you are asking your kid, could you ask him if he knows if the Rams 4x4 Auto system is proportional? On my Explorer the Control Trac transfer case could divert up to 90% of the torque to either the front or rear axle in steps. It was very smooth to engage the fronts when the rear started slipping. From the sounds of the Ram's system it is either engaged or not engaged so when the rear slips it quickly goes into 4x4 Lock until the front and rear axles turn at the same speed then it releases the front. That would seem to be a harsher way of engaging things and could result in a jolt when it does. I've only had mine in Auto once and that was in the rain. I didn't really get on the throttle too hard though so it didn't feel any different than 2WD mode.
+1 on this question, would like to know this also
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  #22  
Old 11-28-2013, 10:16 PM
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I really like the auto 4wd - one of the reasons I bought the Ram ..... Have had it on for the last 2-weeks... Ridiculous smooth. The feel of it is very similar to my Honda Ridgeline but rear-to-front obviously. Doesn't seem to "pop" the front-end and yeah harder on fuel for sure.
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  #23  
Old 12-03-2013, 04:36 PM
dawoodsman dawoodsman is offline
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I have been using auto in mine the last few days more than I thought I would. The reason--slick wet snow, and the fact that you need to handle the throttle with a feather in 2wd to keep the back end from sliding. Might be the OEM tires (Load Range E goodyears that I am not a fan of) but I think it's mostly due to all the power tossed to the wheels. I can't imagine driving a 2 wheel dodge around here without putting dedicated snow tires on it for winter!
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  #24  
Old 12-04-2013, 08:11 PM
mtmedic mtmedic is offline
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I'm up here in central Montana and we have been getting hit hard with weather finally. 12 hours of rain and then freezing temps and 6-12 inches of snow over that makes for very slick conditions. I just bought my 2013 Laramie on Black Friday and have been using the Auto 4wd for the last couple days and it works great. It does what it is designed to do and yes it is a little rougher on the fuel mileage which is to be expected as you are leaving the front end engaged all the time. I had an 05 Chevy Silverado Z71 with the same feature and it always clunked hard when activating the 4wd in auto mode. This new Ram handles twice as good as that Chev and is smooth as butter. I also am not driving around with the pedal mashed either but I am an aggressive driver. If you stand on the pedal and the RPM's spin upwards rapidly and the tires are spinning quickly and the 4wd slams into place then yes you can and will eventually break something. You also might be to dumb to own this nice of a truck. This would be similar to revving the motor and dropping the tranny into drive. It may not break the first or second time but it will eventually. I see no point in not using the system in conditions like this and will leave it in this mode all winter if need be. If it fails (which I do not think will happen) then Chrysler gets to fix it on their dime and I learn about a weak spot on this awesome rig.
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  #25  
Old 12-05-2013, 04:58 AM
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Originally Posted by Asur View Post
+1 on this question, would like to know this also
Well, the kid was having a hard time finding the operational characteristic of the auto transfer case. Here is what he found albeit, nothing we don't already know.

The transfer case engages the front axle using a hydraulic clutch.

As soon as the computer detects rear slippage, the front axle is engaged, this should happen in a millisecond time (vs. seconds) frame, typically less than 300 ms.

There is no proportional engagement, it is all or nothing. Half of the drive-line torque is transferred to the front axle.

Because of the slippage detection time frame, you are not going to see a spinning tire at high engine RPMs before front axle engagement.

Nothing different from what my GM Autotrack systems do.
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  #26  
Old 12-05-2013, 08:31 AM
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Originally Posted by Monster5601 View Post
Well, the kid was having a hard time finding the operational characteristic of the auto transfer case. Here is what he found albeit, nothing we don't already know.

The transfer case engages the front axle using a hydraulic clutch.

As soon as the computer detects rear slippage, the front axle is engaged, this should happen in a millisecond time (vs. seconds) frame, typically less than 300 ms.

There is no proportional engagement, it is all or nothing. Half of the drive-line torque is transferred to the front axle.

Because of the slippage detection time frame, you are not going to see a spinning tire at high engine RPMs before front axle engagement.

Nothing different from what my GM Autotrack systems do.
Thanks for the info, reps for taking the time to check into it
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  #27  
Old 12-05-2013, 09:39 AM
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I used 4WD Auto for the first time a couple weeks ago while deer hunting. In places where I'd spin in 2WD, I would just keep on moving and never noticed any engagement of the front axle. I was driving up and down hills in tall wet grass with stock tires so they typically spin out like hitting a banana peel in Mario Kart.
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  #28  
Old 12-05-2013, 10:08 AM
Brink83 Brink83 is offline
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Reading this tread i have a question about wear and tear on the 4wd. Are you able to flip it from 2WD to 4WD Auto on the fly or does it need to be stopped and in neutral? If you can do this on the fly how fast can you be moving?
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  #29  
Old 12-05-2013, 10:32 AM
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Originally Posted by Brink83 View Post
Reading this tread i have a question about wear and tear on the 4wd. Are you able to flip it from 2WD to 4WD Auto on the fly or does it need to be stopped and in neutral? If you can do this on the fly how fast can you be moving?
It is on the fly. The days of stopping and putting it in Neutral are long gone. Except maybe 4 low. You may need to be stopped for that one. I am sure someone will correct me but with electronic everything you aren't technically doing the shifting. You are "requesting" the computer to do the shifting then the computer decides if it will or won't based on criteria written in the software code. It is the same as turning the key while the engine is running and not hearing that bone jarring sound. The computer won't let the starter turn again while the truck is running.
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  #30  
Old 12-05-2013, 11:01 AM
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Originally Posted by DarthRam View Post
It is on the fly. The days of stopping and putting it in Neutral are long gone. Except maybe 4 low. You may need to be stopped for that one. I am sure someone will correct me but with electronic everything you aren't technically doing the shifting. You are "requesting" the computer to do the shifting then the computer decides if it will or won't based on criteria written in the software code. It is the same as turning the key while the engine is running and not hearing that bone jarring sound. The computer won't let the starter turn again while the truck is running.
Agree ^^^^^^^^^^^^^^^


What is the safe speed to switch to 4 wheel drive auto?


The users manual does not stipulate any speed restriction for going from 2DW to 4WD Auto, it does indicate that releasing the accelerator while turning the knob to 4WD Auto will help speed up the transition from one to the other.

What is the safe speed to switch to 4 wheel drive high?

The manual does not stipulate any speed restriction for going from 2DW to 4WD High, it does indicate that releasing the accelerator while turning the knob to 4WD High will help speed up the transition from one to the other.

The only restriction for this transition is if your truck has a Manually Shifted Transfer Case, if it is, then the max Speed to perform this transition is 55mph, but I have not seen any manual trucks myself.

My rule of thumb is best to keep it under 55mph for any transfer case transitions to Auto or High, but that's just me

4WD Low is a different ball game. It should be done below 3mph or stationary.
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