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Old 10-25-2008, 05:57 PM   #1
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question about 4-high

i've only had my jeep for ~3 weeks, and i just changed the engine oil, transmission and xfer case fluids. i haven't had any opportunity to really put it in 4wd and drive around.

i'm going wheeling for the first time tomorrow so i decided to put it in 4-high when going for a quick trip to walgreens down the street to see how it would react. for the most part it felt ok, no noises or anything... but i noticed that sometimes when taking a turn either left or right the car felt, to put it best, jerky. i put it in 4-low in my parking lot and drove it straight for a a bit and that felt fine, i just wasn't sure if what i was feeling with 4-high was normal. i've read that you can drive up to 45mph in 4-high and the fastest i got between here and walgreens was ~25, and in the parking lot i was probably going ~10-15mph.

so... any thoughts? is this normal activity for 4-high? i just want to make sure my 4wd works before going out tomorrow. thanks guys


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Old 10-25-2008, 06:02 PM   #2
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What kinda roads were you on? Paved or dirt?

I'd stay away from using 4wd on dry paved roads.

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Old 10-25-2008, 06:13 PM   #3
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While I would not recommend using 4wd HI range on a paved road, if you didn't go to far you should be okay. Its really for non smooth road surfaces, gravel, snow, etc. And 4wd LOW is for off-road only, rocks, mud etc. In either of these settings the transfercase, needs slippage to work correctly and not bind anything up so to speak, That is why you got the jerky feeling when turning, as more stress was placed on the system, if you want to think of it that way.
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Old 10-25-2008, 06:14 PM   #4
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it is in 4wd so when you turn on a paved road it will feel kinda jerky. The the front diff is locked so both front wheels are driving. when you turn the wheel that is on the inside of the turn (ie: passenger's side if you are making a right) needs to turn more than the outside wheel (ie: driver's side if you are making a tight) so that causes the jerky feeling. mike is right stay away from 4wd on a paved rd. anyway... what you are experiencing should be normal. as long as it doesn't do it in 2wd.
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Old 10-25-2008, 06:38 PM   #5
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i took it out for another quick drive and i noticed that it only really feels jerky when i turn the wheel far to one side, like when turning in/out of a parking space.

i also noticed that it feels like it gets stuck when i put it in reverse. when i put it in reverse to back into my parking space it feels like the e-brake is partially on and the car doesn't want to roll...
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Old 10-25-2008, 06:40 PM   #6
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sorry, i hit the reply button without refreshing the screen after i posted my question and didn't notice the responses already! oops....

that's good information to know. i thought it felt like the front tires might have been locked, but i don't have a front locker and i didn't know the front diff was already locked.

thanks for the quick responses guys.... yes i was driving on a dry paved road, so that sounds like what is happening. whew, i'm just glad there's no problems with my 4wd system
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Old 10-25-2008, 09:21 PM   #7
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I believe that jerky sensation is known as "crow hopping" and is due to the fact that "Command Trac" does not have differential gears in the transfer case. Therefore I believe a lot of stress is going to placed on the driveshafts and internal parts of the transfer case. (IOW don't do that!)

I will "exercise" my 4WD only on straight dry pavement.

I think you are probably correct that you do not have a locker on the front axle. My LS rear axle drags when surface adhesion is insufficient. (tears up the grass in the front yard!)
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Old 10-26-2008, 11:41 PM   #8
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stay off the pavement in any 4wd thats asking for something to break but souds like everthing is working

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