Whats the difference between 4×4 part time and 4×4 Full time?

I have a 2002 Jeep Grand Cherokee. I was wondering what the difference between the 2 were. And what to use them in. IE: the rain, light snow, heavy snow, etc. Thanks in advance.

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4 Responses to Whats the difference between 4×4 part time and 4×4 Full time?

  1. Animesh June 5, 2010 at 9:40 am #


    There are 2 systems in a 4X4. Both combined give you added mobility.

    1) 4X4 gearbox, this delivers power to all 4 wheels instead of just 2 in ordinary cars.

    2) Differential lock. This makes sure both sides (left & right) continue to turn together in case one starts slipping.

    Engaging both when you don’t need them, will increase fuel consumption like mad.

    Part time 4X4 will disengage the differential lock when you don’t need it. to save you gas money.

    Full time 4X4 will keep both, 4×4 gearbox *and* the differential lock permanently engaged to give you better road grip & traction, but will cost you more gas money.

    Using them wisely will save lives and money.


  2. ken k June 5, 2010 at 9:40 am #

    its what it says it is/use part time if its kind of slippery and use full time if its its snow all over

  3. Erics Towing & Auto Sales Inc. June 5, 2010 at 9:40 am #

    On full time 4X4 all the drive line is in operation all the time(wearing and drawing horse power)
    On part time 4X4 you decide when and if you need low lock
    and after you get back on good terrain back into gas saving 2WD(more performance better MPG.

  4. Clint June 5, 2010 at 9:40 am #

    Part time is where the Jeep will not go into 4×4 unless one of the wheel starts to slip/spin. Then the Jeep will go into 4×4 and all wheels will turn.

    4×4 Full time – is where the jeep is all ways in 4×4 and all 4 wheels are turning all the time.

    Part time should do good in light snow, and wet grasses.
    Full time in heavy snow, and mud….