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What One is Better?

Discussion in 'Chevy Trucks' started by DareDog, Mar 2, 2013.

  1. DareDog

    DareDog PlowSite.com Addict
    Messages: 1,438

    Auto 4wd or 4HI for just driving down road in the winter? when road mite be slippery or snow covered.
  2. carkey351

    carkey351 Senior Member
    Messages: 229

    depends on the road conditions; if it's crappy i.e. a foot of snow on the road then 4hi all the way.

    but if you just have spotty snow then the AUTO might come in handy. In the transfer case there is a set of clutches, along with speed sensor's that are supposed to sense slippage to activate the 4wd. I've not got any experience with it, so I have no idea if it works well or not. It must work at least somewhat or they wouldn't have put it in so many trucks.

    Side note: auto 4wd transfer cases are extra susceptible to the "pump rub" issue search for it either on this site or google for info on the fix if you haven't done it yet. the machined plate to fix it can be had on merchant auto for less than $100 and it will be a permanent fix.
  3. bean7654

    bean7654 Member
    Messages: 63

    I had AUTO on my last truck, 2004 Tahoe. I loved it. I used it all the time. It worked well and never had any issues with it.
  4. White Gardens

    White Gardens 2000 Club Member
    Messages: 2,665

    If you are in 4wd, always 4 hi when going down the road.

    4lo is used when you really need the torque and minimize wheel slippage when really stuck, or trying to pull something extremely heavy where wheel slippage is an issue.

    If you've got Auto, then use it.

    If you've got a ford like mine, just shift on the fly when needed.

  5. crete5245

    crete5245 Member
    Messages: 59

    The auto use the wheel speed sensor of the ABS, to determine slippage then it will lock the tansfercase into 4 hi then when the wheels stop slipping it will take it out of 4 hi.. Auto and 4 hi are the same gear in the transfer case. When you request 4 hi it stays in 4 hi until you switch back to 2 hi. when you select auto, the pcm/bcm will watch wheel speed sensors and switch the transfer case from 2 hi to 4 hi and back depending on the wheel speed sensor inputs as far as slippage of the wheels.
  6. Dr_Goodwrench66

    Dr_Goodwrench66 Member
    Messages: 39

    Personally, I would never use AUTO. Just pretend that button isn't there. If you knew the inner workings of an AUTO Tcase, you'd understand why. They destroy themselves on AUTO. Seen it over and over. So for me, its 4HI or 4LOW. Just my .02.
  7. 2COR517

    2COR517 PlowSite Fanatic
    Messages: 7,115

    Don't plow in Auto. Auto is fine for running around town on slippery roads though.
  8. theholycow

    theholycow PlowSite.com Addict
    Messages: 1,180

    Love Auto 4WD in my 2002 1500 for spotty roads. Almost as good as having a center differential.

    215,000 miles on my original transfer case.
  9. DareDog

    DareDog PlowSite.com Addict
    Messages: 1,438

    this is not plow truck its the daily driver for me to school got 20 mile commute.
  10. Stik208

    Stik208 PlowSite.com Addict
    Messages: 1,316

    2hi or 4hi, I believe the only time auto4 was on in mine other than when I bought it was when I let my wife drive it with a few inches of snow on the ground, GMT900 Sierra.
  11. scott3430

    scott3430 PlowSite.com Addict
    Messages: 1,003

    When in doubt - go in 4HI.
  12. 32vld

    32vld Senior Member
    from LI, NY
    Messages: 617

    Have auto button on my suburban. Never used it.
  13. goel

    goel PlowSite.com Addict
    Messages: 1,079

    We have the auto in all out trucks, and will NEVER use it. If you need 4x4, engage it fully.