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Author Topic: Auto 4wd what controls to engage or not  (Read 1102 times)

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ca2kjet

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Re: Auto 4wd what controls to engage or not
« Reply #25 on: 01/02/18 02:33 PM »

buickwagon that's some awesome information! Thanks for taking the time to do all this.  :thumbsup:
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Black on Black - 2007 Avalanche 4x4 LT3 Z71

spidey

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Re: Auto 4wd what controls to engage or not
« Reply #26 on: 01/02/18 02:45 PM »

I know I have had the hum/vibration/etc if in the Auto AWD mode when I leave it in there by accident.  For the most part I never have it in Auto, but I do haul water all year round, and need traction sometimes in the city where I haul, and backing into my yard as well.

I sometimes forget to take it out when on the highway for a minute or so some days (like yesterday_ but the tell tale sound reminded me to put it to 2WD.  Im not perfect.

I do leave it in Auto sometimes in the city when driving when the roads are bad, just to get better traction from stop lights, etc.  But as soon as Im out of the city I turn it off

It would be nice if they put something on the dash as a reminder of what you are in.  The little light on the knob doesnt work well as a reminder, since its basically hidden when driving by the steering wheel
« Last Edit: 01/02/18 02:47 PM by spidey »
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dna9656

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Re: Auto 4wd what controls to engage or not
« Reply #27 on: 06/21/18 05:56 PM »

How can it damage the front differential? The front diff is open, not a limited slip or locker. 4WD on dry pavement can potentially damage a transfer case, but even that shouldn't happen in Auto since the clutch is disengaged.

From what I can see, the worst thing is some additional miles on the front driveshaft bearings spinning, and a reduction in fuel economy by spinning it. What am I missing here?
My 06 owner's manual says your drive train will wear prematurely if you drive on dry pavement in 4 wd.
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2006 Chevy Avalanche, 2007 Chrysler Sebring,
7 motorcycles 6 Yamaha Venture Royales 1 Road Star, 2 run, others for parts. 2 Dashounds, 1 house. 1 wife.

buickwagon

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Re: Auto 4wd what controls to engage or not
« Reply #28 on: 06/21/18 06:05 PM »

Yes, in 4wd there is no slip between the front and rear drive shafts, so any speed differential due to turns, rolling circumference, etc. will cause strain and tire wear. But the front shaft is not normally engaged in Auto. 
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dna9656

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Re: Auto 4wd what controls to engage or not
« Reply #29 on: 06/21/18 06:09 PM »

 :thumbsup:
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2006 Chevy Avalanche, 2007 Chrysler Sebring,
7 motorcycles 6 Yamaha Venture Royales 1 Road Star, 2 run, others for parts. 2 Dashounds, 1 house. 1 wife.
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