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How does the auto 4wd function

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by dabel, Dec 30, 2010.

  1. dabel

    dabel New Member

    I've been trying to figure out how the auto 4wd actually functions on my '02 1500. I know that the 4wd stays disengaged until it is needed, but what conditions have to happen before it does engage?
  2. murdog94

    murdog94 Epic Member 5+ Years 5000 Posts

    Rear wheel spin will engage the transfer case when you are using Auto 4wd you will always have the front axle engaged. It is better to keep your truck in 2hi unless you are in conditions where you think you will have wheel slip (ergo: snow) but if you are in need of 4wd loke offroad put it into 4wd because the auto function uses a clutch in the transfer case to allow for smooth engagement of the 4wd which over time can wear out or break.
    But basically rear wheel spin at all in auto mode will kick the 4wd on until there is no slip detected.
  3. dabel

    dabel New Member

    Thanks for the quick response. I have just moved to Oklahoma from the south, and am going to have a bigger possibility of driving on ice and/or snow, so I was just wanting to know how it works. I didn't know about the clutch either. How much can the rear tires slip before the transfer case engages?
  4. murdog94

    murdog94 Epic Member 5+ Years 5000 Posts

    You wont really notice lets put it that way. it is pretty much immediate.

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