Which should I be using around town? Half the roads are ice and some are a mix of both all winter. I'm thinking Auto but it seems like it might go into 4WD partially on the dry road. isn't that bad for the 4WD system?
4 Hi or Auto 4WD
- Thread starter puckhead
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rigo_jones
going against
i say 4 hi all the way if the streets are covered with ice. so it wont burn the 4wd motor by going on and off ..
afpj
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Of course, I would have a different opinion so I'll sound off. If there are patches of dry pavement, then Auto mode would be better. 4HI locks the center diff and all wheels turn equally. If you turn on dry pavement, then the strain on the components is not nice. Auto keeps the center diff unlocked so wheels can turn at different rates, and power distributes as needed (not all equal as in 4HI). Now, this is assuming you have 2002 and older ( I recall 2003 it switched to using the ABS system to gain traction, not a mechanical center diff per se- could be wrong on this but concept is similar). There ain't much difference between 4HI and AWD if all the wheels are on ice anyway. My $0.02
Rollin Thunder
Banned for Repeatedly Insulting Members
Of course, I would have a different opinion so I'll sound off. If there are patches of dry pavement, then Auto mode would be better. 4HI locks the center diff and all wheels turn equally. If you turn on dry pavement, then the strain on the components is not nice. Auto keeps the center diff unlocked so wheels can turn at different rates, and power distributes as needed (not all equal as in 4HI). Now, this is assuming you have 2002 and older ( I recall 2003 it switched to using the ABS system to gain traction, not a mechanical center diff per se- could be wrong on this but concept is similar). There ain't much difference between 4HI and AWD if all the wheels are on ice anyway. My $0.02
as I recall auto 4x4 is not what you think. All putting it in auto does is engauge the shaft, but it only sends power to the front wheels if it detects rear slippage, meaning its sending equal power to all 4 when ever the front two wheels are getting power. Your correct how ever on denalis and AWD tahoes 02 and back as far as the difs go.
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