What's that auto 4WD

[JF1957]

When i select that mode its seems to act exactly like when i'm 4X4 mode. I thought that the Auto 4WD engaged the 4X4 mode only when needed and running on 2X4 most of the time.

Best regards and an happy new years to all of you

[kstruckcountry]

It should just have the axle engaged in Auto. When the rear tires spin, the transfer case should send power to the front.

[JF1957]

It should just have the axle engaged in Auto. When the rear tires spin, the transfer case should send power to the front.

That exactly the way i tought it should work but mine is acting (by the sound and the steering wheel feeling) like if it where in 4X4 mode. I tought that the 4WD was working like the AWD does.

[kstruckcountry]

Do you feel the front wheels engage when the rear slips? If not, yeah it could be fully engaged.

[gmtech4]

from the decrip and op section ,

 

During normal driving situations, the transfer case can
operate in the Auto 4WD mode. In the Auto 4WD
mode, the transfer case shift control module monitors rear wheel
slip speed, based on the inputs from both the front and rear
propshaft speed sensors. When the vehicle experiences a rear wheel
slip condition, the transfer case shift control module sends a
pulse width modulated (PWM) signal to an electronic
motor, which is the transfer case encoder motor. This motor rotates
the transfer case control actuator lever shaft, applying a clutch
pack. This clutch pack is designed to deliver a variable amount of
torque, normally delivered to the rear wheels, and transfers it to
the front wheels. Torque is ramped up to the front wheels until the
front propshaft speed sensor matches that of the rear propshaft
speed sensor. Torque is ramped down to the front wheels. The
process would repeat if rear wheel slip is detected again.

 

a pic of the guts for giggles

 

[gmtech4]

im abit pic happy today while watching alumni hockey game !!!

 

 

[gmtech4]

[kstruckcountry]

Holy crap Rob, you're definitely above and behind the call of duty today!!!

[JF1957]

Lol and lol again about Rob and last Danny's post. Well guys thanks for your comments, as i understand Rob info, my auto 4WD doesn't work well because i'm feeling in 4X4 mode on a dry pavement strait line.

[gmtech4]

Holy crap Rob, you're definitely above and behind the call of duty today!!!

lmao !!! i know rite ? i was waitin for the jr hockey to start and i thought what the hell !!!

 

its good info ,,,,i dont mind 1 bit ,,the more we know ,,the more we understand

[hockeypro1411]

Never had the auto 4x4 option so I can't say for sure, but in theory, if the truck is in 2wd and you press the auto 4x4 button, you shouldn't hear the transfer case shift because you're essentially not moving anything mechanical. Now going from 2wd to 4wd, you should hear (and somewhat feel) the the transfer case shift. Do you hear/feel anything when you're stopped in 2wd and press the auto button?

[SarahsGMC]

It's something I never use because

 

Unnecessary wear on t case

 

Isn't very safe when it engages, I know someone that flew off the road when it engaged because a tire grabbed pavement and shot him off the road.

 

 

Sent from the toilet

[JF1957]

Never had the auto 4x4 option so I can't say for sure, but in theory, if the truck is in 2wd and you press the auto 4x4 button, you shouldn't hear the transfer case shift because you're essentially not moving anything mechanical. Now going from 2wd to 4wd, you should hear (and somewhat feel) the the transfer case shift. Do you hear/feel anything when you're stopped in 2wd and press the auto button?

Pressing the AUTO 4WD make me feel exactly the same sensation as if i press the 4X4 button.

[Imcrazy]

It's something I never use because

 

Unnecessary wear on t case

 

Isn't very safe when it engages, I know someone that flew off the road when it engaged because a tire grabbed pavement and shot him off the road.

 

 

Sent from the toilet

Why is it unnecessary wear?

 

Mine works great on my '14 I actually think it handles best in the snow in auto.

[TimmyG]

I agree works great in my 11

 

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