4 Wheel Drive Question

[Ima90sJezus]

Okay -

I've read the manual - just doesn't explain it to me well enough - So I feel like an idiot in asking, but...can someone explain the difference between my '07 KJ 4x4 settings. I also would like to know the driving conditions I use them for?

4 WD Part Time
4 WD Full Time
4 WD Low

 

[tjkj2002]

4 WD Part Time--use only on slippery surfaces like snow,ice,mud,sand,and do not use on dry pavement or wet pavement.

4 WD Full Time--can use on dry pavement,not ideal for offroad use.

4 WD Low--use when extreme traction is needed,used mostly for offroading and hill climbs and desents to help save your brakes.

 

[ephantmon]

tjkj explained the different conditions in which you can/should use them. In case you want further info, here's a little:

Part-time: Your front and rear diffs are locked, that is, the left and right tires must rotate at the same speed. ANY turning means the inner tire rotates more slowly than the outer tire. This isn't a problem if you're in the aforementioned slippery mud, snow, etc. If you're on dry pavement, the outer tires "push" the inner tires and you get (possibly severe) binding (damage).

Full-time: Power to all four wheels, but diffs are open, thus allowing inner and outer tires to rotate independently. You can safely use this option on dry roads, no binding involved.

Low Range: This one I'm not so sure about. I know it involves your engine running at a different speed, thus you're never supposed to go faster than something like 30mph due to the severe load/stress it creates.

 

[J-Thompson]

tjkj explained the different conditions in which you can/should use them. In case you want further info, here's a little:

Part-time: Your front and rear diffs are locked, that is, the left and right tires must rotate at the same speed. ANY turning means the inner tire rotates more slowly than the outer tire. This isn't a problem if you're in the aforementioned slippery mud, snow, etc. If you're on dry pavement, the outer tires "push" the inner tires and you get (possibly severe) binding (damage).

Full-time: Power to all four wheels, but diffs are open, thus allowing inner and outer tires to rotate independently. You can safely use this option on dry roads, no binding involved.

Low Range: This one I'm not so sure about. I know it involves your engine running at a different speed, thus you're never supposed to go faster than something like 30mph due to the severe load/stress it creates.

wow
not quite
4wd par time the front and rear diff's are locked togeather
the diff's are open (unless you have a locker which I do and I drive on dry pavement with no issues)
4wd full time there is an "lsd" between the front and rear diff allowing them to turn at different speeds ,mostly allowing the front to "free wheel"
4wd low ,same set up as 4wd part time but with a 2.72 to 1 gear reduction
no change to the engine

diff. lockers have no bearing on how any of the 4wd modes function ,they will make them all seem to work better
the 4wd modes or transfer case have no real bearing on how the engine runs

 

[tjkj2002]

Low Range: This one I'm not so sure about. I know it involves your engine running at a different speed, thus you're never supposed to go faster than something like 30mph due to the severe load/stress it creates.

Sort of.

the 4wd modes or transfer case have no real bearing on how the engine runs

In 4 low it does as that 2.72:1 reduction means higher engine rpm's.

 

[J-Thompson]

Sort of.



In 4 low it does as that 2.72:1 reduction means higher engine rpm's.

yeah but it changes nothing relative to the engine
the engine speed is caused by the reduction but engine speed is affected the same by the gears in the transmission just a much lower version

 

[Ima90sJezus]

Thanks to all for the information....

thanks...