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Old 02-11-2013, 05:02 PM   #1
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How can I test that my 4wd works?

As the title says. Is there a way to test to make sure the 4hi and 4lo work?

The shifter feels fine and the lights come on accordingly. I'm not sure I can tell the difference while driving. The best I got around here is a couple of dirt rows.

Thanks in advance.

ps I apologize if there is an informative thread on this already. Android app search function sucks.

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Old 02-11-2013, 05:05 PM   #2
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Take off your rear drive shaft, put in 4x4 an see if you move. Easier yet, put it in 4x4 and turn sharply on pavement and see if the steering jumps and the wheels chirp

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Old 02-11-2013, 05:06 PM   #3
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Better yet, Hit the DIRT!
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Old 02-11-2013, 05:19 PM   #4
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Quote:
Originally Posted by loganw View Post
Take off your rear drive shaft, put in 4x4 an see if you move. Easier yet, put it in 4x4 and turn sharply on pavement and see if the steering jumps and the wheels chirp
I have not taken the shaft out but I have done the second one. They do chirp and seem to fight each other.

How can I tell the difference between hi and lo?


Hitting the dirt is the plan but around here all I have is a couple of private dirt roads. I want to make sure things are working before I take the 100 mile trip to hard rock.
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Old 02-11-2013, 05:26 PM   #5
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You should pull significantly higher RPMs while in lo than in hi when traveling the same speed. It sounds like it is working though
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Old 02-11-2013, 05:55 PM   #6
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4 low should feel like your on the back of a nanny goat and can go anywhere
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Old 02-11-2013, 05:56 PM   #7
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It is a bad idea to use 4wd high or low on dry pavement.
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Old 02-11-2013, 06:00 PM   #8
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Originally Posted by 99georgiatj View Post
It is a bad idea to use 4wd high or low on dry pavement.
Yes, it will cause your t-case to bind and can grenade it
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Old 02-11-2013, 06:00 PM   #9
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Quote:
Originally Posted by 99georgiatj View Post
It is a bad idea to use 4wd high or low on dry pavement.
why? you can use 4wd on rock, often gaining more traction than pavement. why cant you use it on dry pavement? generally there is no need to, but why would it hurt?
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Old 02-11-2013, 06:06 PM   #10
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why? you can use 4wd on rock, often gaining more traction than pavement. why cant you use it on dry pavement? generally there is no need to, but why would it hurt?
Around turns the front and rear driveshafts spin at different speeds but they can't if you're in 4hi/lo. That will cause binding and possible damage.
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Old 02-11-2013, 06:06 PM   #11
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Quote:
Originally Posted by tallzdatank View Post
why? you can use 4wd on rock, often gaining more traction than pavement. why cant you use it on dry pavement? generally there is no need to, but why would it hurt?
When on rock your crawling and your wheels can slip still cause your off camber/climbing, on pavement you'll have some speed and since theres no differential in the tcase it will cause it to bind when you turn. The wheel hop from turning will eventually wear out your u-joints and cause them to fail which will take your shafts with it.

The only time I use 4wd on dry pavement is when I use 4low to back up my steep driveway and to back my trailer up my driveway.
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Old 02-11-2013, 10:37 PM   #12
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If you don"t have lockers you could always jack up one front tire and one rear. I would highly recommend you block the tires left on the ground.
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Old 02-12-2013, 03:02 AM   #13
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If you don"t have lockers you could always jack up one front tire and one rear. I would highly recommend you block the tires left on the ground.
Just be careful here, many Tj's came with limited slip rear diffs that could easily push the jeep off jacks or stands with just one wheel touching in the back (or wherever the limited slip is). Even if you don't have a limited slip, open diffs still put a little power to the tire with traction, even if one is in the air. Gun it too fast and you could come off the stands as well.

EASY WAY TO TEST: Jack up the front of the jeep so the front wheels only are in the air. Try to turn them. In 2wd the front wheels should turn without the back ones needing to move. Now pull the handle into 4wd. You should no longer be able to move the front tires.

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Old 02-12-2013, 05:46 AM   #14
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If you don"t have lockers you could always jack up one front tire and one rear. I would highly recommend you block the tires left on the ground.
Thought about this but teo afraid of the situation below. Unless I jack up all four.

Quote:
Originally Posted by jeepwayoflife View Post

Just be careful here, many Tj's came with limited slip rear diffs that could easily push the jeep off jacks or stands with just one wheel touching in the back (or wherever the limited slip is). Even if you don't have a limited slip, open diffs still put a little power to the tire with traction, even if one is in the air. Gun it too fast and you could come off the stands as well.

EASY WAY TO TEST: Jack up the front of the jeep so the front wheels only are in the air. Try to turn them. In 2wd the front wheels should turn without the back ones needing to move. Now pull the handle into 4wd. You should no longer be able to move the front tires.

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If my build sheet is correct I don't have limited slip. I got the sheet from that one link in these forums so I only trust it so much. I do like your approach to checking it with the engine off.

I was going through the owner's manual and it says to have the jeep go about 2-3 mph when shifting to 4lo. I tried once and that proved to be really awkward to do. It also says to not do it while standing still. Is it really a big deal to do so? Shifting while standing still I mean.
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Old 02-12-2013, 10:53 AM   #15
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Originally Posted by elclipo View Post
I was going through the owner's manual and it says to have the jeep go about 2-3 mph when shifting to 4lo. I tried once and that proved to be really awkward to do. It also says to not do it while standing still. Is it really a big deal to do so? Shifting while standing still I mean.
When you shift into and out of 4LO, you are changing gears much like shifting from 1st to 2nd in a manual transmission. The difference is your transmission has a clutch which lets you disconnect the engine while you make the shift... but a transfer case does not. If you've ever tried shifting a manual without a clutch, you know how you can get lots of scary-sounding grinding when you do this. This is why Chrysler tells you how to operate your transfer case. If the vehicle is moving slightly (at 2-3 MPH), you will get less gear clash when making the shift into and out of 4LO. It will also reduce the effort required when you're moving the lever.

There may be times, however, when you're in a bad position and you have to engage 4LO while you're not moving. In this case, you can try to make the shift anyway but you are very likely to get lots of gear grinding. If things are really bad, you might not be able to get the transfer case into or out of 4LO. If that happens, it is suggested that you turn off the engine and try to complete the shift, then restart the engine and continue on your way.

Plan ahead. If you think you're gonna need 4LO, engage it while it is easy to do so.

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