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All wheel drive???
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Author:  Zonie [ Thu Feb 04, 2010 8:20 pm ]
Post subject:  All wheel drive???
I've never used my 4 wheel drive capabilities in my 06 liberty and due to weather conditions now need to engage the all wheel drive (not the 4x4). My question is what is the all wheel labeled. It's confusing! Can someone clarify for me which is which?
Author:  ATXKJ [ Thu Feb 04, 2010 8:28 pm ]
Post subject:  Re: All wheel drive???
Full Time - means you can use it Full Time and that includes on dry roads
(it's not really AWD - but that's a transfer case definition )
it has a differential between front and rear.

if you have a problem - make sure your tires are matched front to rear
the lever pushes a spring which pushes the gear
if there's any difference front to rear - wear, tires size, pressure -
it won't engage - or if it engages it won't disengage.


Part time - front and rear are locked together and should only be used off road -
or very slippery conditions.
Author:  warp2diesel [ Thu Feb 04, 2010 9:11 pm ]
Post subject:  Re: All wheel drive???
I use Part Time when the road is slick or I am off road, in part time the diferental between front and rear is locked up.
I use Full Time when there is snow on the road with some bare spots in between.
Another good use for Part Time is in the Spring when the roads are wet from rain and there is still oil spots and light spills at the stop lights. When you punch your CRD you will leave the big block two wheel drive SUVs and Pickups spinning their wheels trying to catch up.
Author:  LibertyCRD [ Thu Feb 04, 2010 9:25 pm ]
Post subject:  Re: All wheel drive???
Yep but Part Time should be used very sparingly...even in rain because any turning of the wheel at all really puts stress on the t-case when it's locked up like that. Full Time is much better on pavement regardless of conditions. You get the same traction but your t-case isn't in a bind.

The time Part Time is nice is off road when you may lift a tire. In that case you want the front and rear locked together for max. traction.
Author:  tjkj2002 [ Thu Feb 04, 2010 9:31 pm ]
Post subject:  Re: All wheel drive???
Do not use Part Time 4wd on wet pavement,wet pavement is not slippery enough and will cause binding which can lead to major failure of drivetrain parts.


Oh and only driving straight will still cause binding since the F/R diffs are ever so slightly geared differently.
Author:  tjkj2002 [ Thu Feb 04, 2010 9:33 pm ]
Post subject:  Re: All wheel drive???
LibertyCRD wrote:
The time Part Time is nice is off road when you may lift a tire. In that case you want the front and rear locked together for max. traction.

You need to install F/R lockers for that to happen in part time/4 low and the KJ has never came from the factory with a locker you need to install them.

Being in part time or 4low only locks the F/R driveshafts so they spin the same speed all the time and not the wheels.
Author:  LibertyCRD [ Thu Feb 04, 2010 9:37 pm ]
Post subject:  Re: All wheel drive???
tjkj2002 wrote:
LibertyCRD wrote:
The time Part Time is nice is off road when you may lift a tire. In that case you want the front and rear locked together for max. traction.

You need to install F/R lockers for that to happen in part time/4 low and the KJ has never came from the factory with a locker you need to install them.

Being in part time or 4low only locks the F/R driveshafts so they spin the same speed all the time and not the wheels.



Um... no. When you put it in Part Time the front and rear are locked together. Both get 100% traction.

Lockers lock the wheels together. It's a separate thing altogether.
Author:  Sir Sam [ Thu Feb 04, 2010 9:43 pm ]
Post subject:  Re: All wheel drive???
LibertyCRD wrote:
tjkj2002 wrote:
LibertyCRD wrote:
The time Part Time is nice is off road when you may lift a tire. In that case you want the front and rear locked together for max. traction.

You need to install F/R lockers for that to happen in part time/4 low and the KJ has never came from the factory with a locker you need to install them.

Being in part time or 4low only locks the F/R driveshafts so they spin the same speed all the time and not the wheels.



Um... no. When you put it in Part Time the front and rear are locked together. Both get 100% traction.

Lockers lock the wheels together. It's a separate thing altogether.


He is saying that with the center differential locked the only thing you are guaranteed is that the front and rear driveshafts are turning at the same rate, you can still have a front wheel still, while the other is spinning, and a rear wheel still, while the other is spinning.
Author:  tjkj2002 [ Thu Feb 04, 2010 9:44 pm ]
Post subject:  Re: All wheel drive???
LibertyCRD wrote:
tjkj2002 wrote:
LibertyCRD wrote:
The time Part Time is nice is off road when you may lift a tire. In that case you want the front and rear locked together for max. traction.

You need to install F/R lockers for that to happen in part time/4 low and the KJ has never came from the factory with a locker you need to install them.

Being in part time or 4low only locks the F/R driveshafts so they spin the same speed all the time and not the wheels.



Um... no. When you put it in Part Time the front and rear are locked together. Both get 100% traction.

Lockers lock the wheels together. It's a separate thing altogether.

In bold will leave you immobile unless you have lockers regardless of what t-case range you are in.
Author:  warp2diesel [ Thu Feb 04, 2010 10:35 pm ]
Post subject:  Re: All wheel drive???
tjkj2002 wrote:
Do not use Part Time 4wd on wet pavement,wet pavement is not slippery enough and will cause binding which can lead to major failure of drivetrain parts.


Oh and only driving straight will still cause binding since the F/R diffs are ever so slightly geared differently.


It is OK for a Fast straight start (not turning) on a oily wet intersection, shift back into two wheel drive after the deed. If you don't believe me come up to the Midwest in the spring and give it a try.
Author:  tjkj2002 [ Thu Feb 04, 2010 10:40 pm ]
Post subject:  Re: All wheel drive???
warp2diesel wrote:
tjkj2002 wrote:
Do not use Part Time 4wd on wet pavement,wet pavement is not slippery enough and will cause binding which can lead to major failure of drivetrain parts.


Oh and only driving straight will still cause binding since the F/R diffs are ever so slightly geared differently.


It is OK for a Fast straight start (not turning) on a oily wet intersection, shift back into two wheel drive after the deed. If you don't believe me come up to the Midwest in the spring and give it a try.

I'm originally from the midwest,never needed 4wd on a wet paved road.Time for better tires,or in your case wider for some traction.
Author:  DarbyWalters [ Thu Feb 04, 2010 10:58 pm ]
Post subject:  Re: All wheel drive???
Full Time...dash light is GREEN...means you are safe to use on any surface...dry/wet/slippery/snow

Part Time...dash light is AMBER...means use with caution...only offroad basically

Yes, you "could" use Part Time on a snowy road but why? Full Time is much better for any roads in any conditions.
Author:  LibertyCRD [ Thu Feb 04, 2010 11:12 pm ]
Post subject:  Re: All wheel drive???
He is saying that with the center differential locked the only thing you are guaranteed is that the front and rear driveshafts are turning at the same rate, you can still have a front wheel still, while the other is spinning, and a rear wheel still, while the other is spinning.[/quote]

My original comment was that in Part Time, the front and rear are locked together. That is a true statement. If you lift a wheel while in Part Time, you still have the opposite end trying to pull...just as I said.

In Full Time, it is possible to have only one tire trying to pull because of the way the center diff. works. But on the road, when all tires are in contact with the road all the time, Full Time will give you just as much traction as Part Time, without binding the t-case. So Full Time is what I recommend.
Author:  geordi [ Sat Feb 06, 2010 3:10 pm ]
Post subject:  Re: All wheel drive???
Listen to LibertyCRD. When I got stuck a couple weeks ago doing something stupid, I had it in part-time (so locked together) and was still quite stuck. The left-front and the right-rear were BOTH effectively in-the-air, b/c on that ice they had ZERO traction, while the other two were stationary - They had traction to hold them.

My only question about that situation was that if I had a single locker, on the rear differential... Would it have forced the front to behave as well, or would I need a lock for both differentials.

For that specific event however... Come-along + helpful tree FTW.
Author:  chrispitude [ Sat Feb 06, 2010 4:06 pm ]
Post subject:  Re: All wheel drive???
geordi wrote:
Listen to LibertyCRD. When I got stuck a couple weeks ago doing something stupid, I had it in part-time (so locked together) and was still quite stuck. The left-front and the right-rear were BOTH effectively in-the-air, b/c on that ice they had ZERO traction, while the other two were stationary - They had traction to hold them.

My only question about that situation was that if I had a single locker, on the rear differential... Would it have forced the front to behave as well, or would I need a lock for both differentials.

For that specific event however... Come-along + helpful tree FTW.


Can you ride the brakes while you give a bit of throttle?

- Chris
Author:  geordi [ Sat Feb 06, 2010 4:24 pm ]
Post subject:  Re: All wheel drive???
If I had a limited slip... Maybe that might have worked. But I'm pretty sure I have an open differential, based on a previous thread here.
Author:  tjkj2002 [ Sat Feb 06, 2010 9:33 pm ]
Post subject:  Re: All wheel drive???
geordi wrote:

My only question about that situation was that if I had a single locker, on the rear differential... Would it have forced the front to behave as well, or would I need a lock for both differentials.


F/R lockers are needed to make all 4 wheels turn no matter what.Just adding a rear locker will help but make exploding the front diff more likely offroad and you raise a front wheel.
Author:  007husky [ Sun Feb 07, 2010 1:36 pm ]
Post subject:  Re: All wheel drive???
From my observations...

Full time: use any time as desired, great for enhanced traction on wet stuff, or to drive like an ( * ) fast on turns etc.
Not as good as part-time on snow or mud. having extra traction on the front wheels with full time, helps immensely when going fast in tight turns or exit ramps.

Part time: ONLY for really slippery surfaces, if you use it on dry or wet non slippery... you can feel it bind. Even in tight turns on snow. I think, is MUCH better than full time in loose gravel, snow or mud... I just drove this weekend from DC to Philly on the
Snow storm and full time was not enough to hold traction as well as part time was. from the 140 miles on the storm,
most of the time was in 4 part time.

As a matter of fact, i was passing people and trucks with total confidence with 4 part time. Even passed a real military humv, but probably because the guy was driving like a Pansy.
Author:  JL Rockies [ Sun Feb 07, 2010 1:49 pm ]
Post subject:  Re: All wheel drive???
tjkj2002 is right.
Author:  CRD Joe [ Sun Feb 07, 2010 3:12 pm ]
Post subject:  Re: All wheel drive???
The NV242 has what I consider an "All Wheel" like ability, in that you can put it in play at highway speeds in any condition. I use mine in snow mostly. Part time is what everyone is talking about. A gravel, mud,snow etc environment that four wheel drive is necessary. If youve spent much time wheeling you'll know that 90% of the time you'll want four wheel drive youll want to be in four LO! That 2.72 to 1 low range makes a big difference when four wheel drive obsticles are in play.
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