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Old 12-11-2019, 06:31 PM
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switching to 4wD

so I just got my driveshaft on my Jeep 00' wrangler tj and now I have a reason to use the 4wd shift. so the questions are what's the difference between 4l and 4h, does it need to be in N to shift and is it kinda hard to shift into both positions or should it be easy

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Old 12-11-2019, 07:19 PM   #2
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4Hi and 4Lo are both offroad only, don't use them on dry pavement. It won't hurt the 4x4 system if you do but the Wrangler's 4x4 system is really meant primarily for low-traction road surfaces like offroad trails. Or streets that are COMPLETELY covered with snow or ice. Not just wet from rain. But if the roads were totally covered with snow or ice it's ok to shift into 4Hi for driving.

You can shift back and forth between 2wd and 4Hi at any safe speed, like if you were driving on snow and then the roads became free of snow you can shift back into 2Hi without stopping.

4Hi can also be used while offroad but 4Hi is meant for faster speeds than most offroading is done with. 4Hi would be great for getting through a big long muddy stretch or deep sand where you need plenty of wheel speed and vehicle speed to get through.

You have to be either stopped or at a dead-slow crawl to shift into 4Lo. It'll grind at times shifting into 4Lo which is normal, sometimes you have to drive a few inches in 4Hi so the 4Lo gears will be aligned well enough that you can shift into 4Lo. 4Lo is for slow-speed offroading on a trail that is too uneven/too tough to drive fast on. It gives you more torque and control on tough offroad stretches. It's not good to drive at fast speeds when in 4Lo so when trail conditions get good enough that you can drive at faster speeds, shift back into 4Hi or 2Hi.

If you drove on dry pavement in 4Hi (or 4Lo) you'd notice the steering is wonky and jerky. That's because the Wrangler's part-time (offroad only) 4x4 system locks the front and rear axles together in 4Hi and 4Lo which means the front tires aren't able to rotate faster than the rear tires when you're turning left or right which will cause the Jeep to "crow hop" or lurch though a turn whenever you're on pavement and in 4Hi or 4Lo. Which is why 4Hi and 4Lo aren't meant for the pavement.

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Old 12-11-2019, 07:31 PM
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Quote:
Originally Posted by Jerry Bransford View Post
4Hi and 4Lo are both offroad only, don't use them on dry pavement. It won't hurt the 4x4 system if you do but the Wrangler's 4x4 system is really meant primarily for low-traction road surfaces like offroad trails. Or streets that are COMPLETELY covered with snow or ice. Not just wet from rain. But if the roads were totally covered with snow or ice it's ok to shift into 4Hi for driving.

You can shift back and forth between 2wd and 4Hi at any safe speed, like if you were driving on snow and then the roads became free of snow you can shift back into 2Hi without stopping.

4Hi can also be used while offroad but 4Hi is meant for faster speeds than most offroading is done with. 4Hi would be great for getting through a big long muddy stretch or deep sand where you need plenty of wheel speed and vehicle speed to get through.




You have to be either stopped or at a dead-slow crawl to shift into 4Lo. It'll grind at times shifting into 4Lo which is normal, sometimes you have to drive a few inches in 4Hi so the 4Lo gears will be aligned well enough that you can shift into 4Lo. 4Lo is for slow-speed offroading on a trail that is too uneven/too tough to drive fast on. It gives you more torque and control on tough offroad stretches. It's not good to drive at fast speeds when in 4Lo so when trail conditions get good enough that you can drive at faster speeds, shift into 4Hi or 2Hi.

If you drove on dry pavement in 4Hi (or 4Lo) you'd notice the steering is wonky and jerky. That's because the Wrangler's part-time (offroad only) 4x4 system locks the front and rear axles together in 4Hi and 4Lo which means the front tires aren't able to rotate faster than the rear tires when you're turning left or right which will cause the Jeep to "crow hop" or lurch though a turn whenever you're on pavement and in 4Hi or 4Lo. Which is why 4Hi and 4Lo aren't meant for the pavement.
Thank you. Great answer
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Old 12-11-2019, 07:33 PM   #4
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There may be a difference between the JK and the TJ. But probably not, so here is some more specifics to the above explination (which is spot on)

You can shift in and out of 4Hi (from 2wd to 4Hi and back again) up to 40mph

Once in 4Hi you can drive up to 80mph

When I shift to 4Lo, I usually come to a complete stop, shift the N then make the shift. When I first get into 4Lo I make sure to drive a few feet (or roll back) to make sure its fully shifted before giving it any throttle
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Old 12-11-2019, 07:52 PM
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does your jeep reverse weird when it's shifted ?
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Old 12-11-2019, 08:32 PM   #6
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does your jeep reverse weird when it's shifted ?
Describe weird and shifted. In 4wd hi and low, only the steering is slightly noticeably different as in turning left and right. Slightly on soft loose ground and noticeably on dryer harder surfaces. If that makes sense.
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Old 12-14-2019, 11:22 PM   #7
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It is good to put the jeep in park or neutral and put into 4wd. Some will say you can do it while driving, but I stop to be easier on the gears. I know a few friends that even after switching from 4wd to 2wd they might have to drive backs 5-15 ft for it to disengage. Just in case yours doesn't try going backs a little and you will feel it unlock.

Like previous only on loose ground. Because on dry pavement going straight is fine but when you turn the outside front tire is going a different speed then the inner back tire. That means the drive shafts are trying to go different speeds and connected to the same gear. Loose soil (ice, gravel, mud, etc...) if it gets in a bind the ground gives free and a tire can slide across it instead of the transfer case.

4L and 4H are very different. Think of 4L like a tractor, goes slow but has power. 4H is like drive on the interstate, goes as fast as the vehicle can go. So you would use 4L for rock crawling and 4H for muddling kind of things.
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Old 12-15-2019, 05:22 PM   #8
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My TJ factory manual says to drive forward while in 4HI, shift transmission to neutral and slow to 2-3 MPH, then shift T-case to 4LO. Works for me.

It also warns against attempting to shift into 4LO either while moving at above 2-3 MPH, or while stationary.

Of course, if you experience the dreaded "Instrument Cluster Failure", you're out of luck!
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Old 12-15-2019, 07:34 PM   #9
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Quote:
Originally Posted by tntitans21399 View Post
It is good to put the jeep in park or neutral and put into 4wd. Some will say you can do it while driving, but I stop to be easier on the gears. I know a few friends that even after switching from 4wd to 2wd they might have to drive backs 5-15 ft for it to disengage. Just in case yours doesn't try going backs a little and you will feel it unlock.
RTFM. 4Hi is synchronized and you can shift back & forth between 2hi and 4Hi at any safe speed. No need to stop, no benefit to stopping either. None, nada, zip.

Backing up does nothing to speed 4Hi disengagement for the type of tcase the Wrangler has. They would have shifted back to 2wd driving forward with NEUTRAL throttle in the same time you wasted backing up. Again, this type of transfer case does not benefit by backing up to disengage 4Hi, doing so does not speed or help the process.
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Old 12-16-2019, 01:36 AM   #10
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There is nothing synchronized in a TJ transfer case but yes the 2H to 4H and back shift can be done at ANY safe speed....
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Old 12-17-2019, 07:51 AM   #11
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Confirmed. I shift between 2WD and 4HI when needed. Shifting at highway speeds still smooth as butter. For 4HI/4LO... I am usually stopped (sometimes crawling) and make a quick shift going going into LO.

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