What The?!

[lionsbreath]

I used to have that opt. in a jeep cherokee that I had and i love the awd setting for rainy roads and snow.

 

[toyrunner95]

ok so let me get this streight,

2hi and 4low are as they used to be.

4hi is 4wd without the binding action of a locked up transfercase and front differential, (it wont bind when you turn corners like the 2nd gen did.) does it just have a little more "give" in the drive line so you can move at faster speeds?

H4L is the locked center differential. so it engages the limited slip in the front a little more actively, so in actual off road conditions it works a little better.

and the rear diff lock works only in 4low right? (but we can fix that )

so i guess my questions are,

1. is it a true shift on the fly, can i put it in H4H at 60mph?
2. does it allow faster speeds than H4L? i have noticed a little more whine in the front pumpkin and t case when it is in H4L
3. what does "locked center differential" mean. i know what locked means and i know what a differential is. but i have never seen a center differential. is it in the t case, is it before or after the t case? i just dont get it yet.

 

[Bergger]

I think you are getting it. This is the best I can explain it and the best I understand it. With the center diff unlocked think of 4hi as all wheel drive. With the center diff open the front and rear axles can rotate differently, thus no binding. Great for wet or snowy pavement and dirt roads. If you lock the center diff if causes the front and rear axles to split 50/50, like most 4wheel drives. This means better traction in rough stuff but not good for pavement, you'll get binding. When you us 4low it simply lowers your gearing. I can't remember if you can engage 4low with the center diff open or if it has to be locked. I hope this makes sense but regardless you have a great system on that truck.

 

[Tucson T4R]

I think you are getting it. This is the best I can explain it and the best I understand it. With the center diff unlocked think of 4hi as all wheel drive. With the center diff open the front and rear axles can rotate differently, thus no binding. Great for wet or snowy pavement and dirt roads. If you lock the center diff if causes the front and rear axles to split 50/50, like most 4wheel drives. This means better traction in rough stuff but not good for pavement, you'll get binding. When you us 4low it simply lowers your gearing. I can't remember if you can engage 4low with the center diff open or if it has to be locked. I hope this makes sense but regardless you have a great system on that truck.

Mine is a V8 so I don't have a 2WD option. You can lock the center diff at any speed (just not on dry pavement). You can drive the same speeds with the center diff locked or not.

I'm not sure about shift from 2 to 4 WD. You should read the manual for that one.

Obviously to change from high to low range, you need to be stopped and in neutral.

I don't know where the Torsen center diff is located but I assume it is in the transfer case after the transmission since that is the only place both the front and rear drive shafts come together for the Torsen to manage them.

As far as what does locked mean...think of it as you would an axle with a locker. Open, the two wheels can spin independent of each other, Locked, they are mechanically tied together and turn the exact same speed. Now take that concept and think of your front and rear axles as the wheels on a locked axle. Open, your front and rear axles can turn at different speeds and therefore do not bind up on solid traction surfaces like pavement. Locked center diff mechanically connects the front and rear axles so they must turn at the same speed.
You would only use the locked center diff on loose or slippery surfaces, just as you would only engage an axle locker on slippery surfaces.

Hope that helps.

 

[toyrunner95]

well we got snowed on last night like 5 inches so i got to play in it a bit. i have found that you can use BOTH 4 highs as shift on the flys. a trick to get it to lock in faster is to put the truck in neutral, shift the 4wd stick, then pop it back in to drive. it locks up faster and actually goes into gear much easier. at speeds of about 60 the H4L works OK. i personally wouldent use it at all above that. it puts alot of stress on the components. however, H4H works like a champ at speed because there is A LOT less binding of the gears other components. my girlfriend and i got to play with it in 4lo a little bit too..... wait why do i want to buy a jeep again? dang-nab-it! now im all confuseled DRAT!

 

[Tucson T4R]

.............. wait why do i want to buy a jeep again? dang-nab-it! now im all confuseled DRAT!

:jump: :victory: