Jeep Cherokee

Discussion in 'OT Driven' started by ChosenGSR, Dec 2, 2006.

  1. ChosenGSR

    ChosenGSR Mama always said you'd be the chosen one

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    So what's the deal with the "part time" 4WD systems such as the one in late 90s Cherokee? As far as I understand the 4WD option can only be used in snow, not on dry pavement. So what will happen, the transfer case will blow or something? I am not exactly understanding how such system is utilized. Also how does the reliability in the Cherokee compare to that of the Grand Cherokee? From all I've read the Grand Cherokee is horrible compared to the regular Cherokee. Keep in mind I am talking late 90s, maybe 97-99 models. I might be considering a beaters this year as I don't want to drive my M3 all year around and I am looking into cheap all weather options.
     
  2. P07r0457

    P07r0457 New Member

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    part-time is what most 4x4 systems are... This means you can manually switch it between 2wd and 4x4 operation. full-time is available on some vehicles such as grand cherokee's and nissan armanda/pathfinder suvs. This is an electronic system that automatically switches between 2wd and 4x4 operation -- sometimes with the use of a center viscous differential to provide a mostly-4x4 connection with enough slippage allowed to prevent damage on high-traction roads.

    This should explain a little better WHY 4x4 can damage the vehicle when used on dry pavement:

    http://auto.howstuffworks.com/differential.htm

    Basically when turning, all 4 wheels take a slightly different path, and turn at different speeds, for different distances. This require one wheel to turn at a different speed than the others. On an axle, this is possible with limited-slip or open (standard) differentials. With a normal 4x4 transfer-case, the front and rear are locked together -- which does not allow for this "slippage" to occur.
     
  3. ChosenGSR

    ChosenGSR Mama always said you'd be the chosen one

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    So say I am driving on a day that has lots of black ice, but there is plenty of stretches with no ice at all. Am I basically not allowed to be driving in 4WD because it's not continuously slippery?
     
  4. affende

    affende Resident 4X4 Elitest Prick

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    it will be fine for short periods. as long as you arent turning constantly in 4WD then there is little to worry about.
     
    Last edited: Dec 4, 2006
  5. ChosenGSR

    ChosenGSR Mama always said you'd be the chosen one

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    you mean as long as you're NOT right?
     
  6. popsnbeer

    popsnbeer New Member

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    ^^ i think thats what he meant.
     
  7. P07r0457

    P07r0457 New Member

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    It's turning that hurts 4x4... So straight roads are fine. Even straight stretches of dry pavement are fine for 4x4... When you turn the wheel and there's too much traction -- that's when you run into problems.
     
  8. IslanderOffRoad

    IslanderOffRoad Do you even lift kit? OT Supporter

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    Cherokee FTW
     
  9. affende

    affende Resident 4X4 Elitest Prick

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    yes. that is what i meant.
     
  10. KWood94XJ

    KWood94XJ New Member

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    the part time command trac system doesnt let the wheels spin at diffrent speeds so there has to be some slipage or you damage your diff and t-case. the selec-trac system does so it is safe to run all the time.
     
  11. IslanderOffRoad

    IslanderOffRoad Do you even lift kit? OT Supporter

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    but why would you want to?
     
  12. P07r0457

    P07r0457 New Member

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    i... don't.... know.....
     

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