post #1 of Old 07-21-2010, 09:16 AM Thread Starter
cadeddie
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Slow wobble during u-turn on pavement while in 4x4

ok took my 2008 JKU for some light offroading in the sand this weekend for the first time...(with 35")
I was driving thru some sand and jumped on a paved road really quick to do a turnaround (u-turn)...while doing this turnaround I noticed this uneasy slow wobble like if coming from the tires (while doing the u-turn on pavement only) is this normal?
Everything went back to normal once i got back on the sand and driving straight again.
Drove back home perfectly after that

what do you guys think?

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post #2 of Old 07-21-2010, 09:20 AM
1398653
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dont use 4 wheel drive on pavement unless it is covered in snow. It is bad for the jeep and will eventully cause damage. What you are describing sounds normal when one attempts to drive in 4 wheel drive on pavement but cannot be too sure becasue I have never done it. I only use 4 wheel drive off road in low and rarely use 4wd high.

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post #3 of Old 07-21-2010, 09:31 AM Thread Starter
cadeddie
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I jumped on the pavement to do a u-turn for like about 15 seconds....that is all....by the way thanks for the reply
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post #4 of Old 07-21-2010, 09:39 AM
jerseyjeep2003
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This sounds normal, as your driveline is trying to bind up due to the wheels having traction. engaged 4X drive + DRY pavement = broken Jeep. Actually, short (25 feet or so) straight and s l o w won't hurt, as long as ya don't make a regular practice of it.

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post #5 of Old 07-21-2010, 09:47 AM
mikek3
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This is normal when using 4 wheel drive on a dry road/pavement. However, extended use like this is not good for your Jeep.
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post #6 of Old 07-21-2010, 09:55 AM
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FYI: Driveline bind, binding hubs, axle wind up, axle bind, drive line wind up - all terms for one thing: stress due to part time 4 wheel drive

Basically, to go in a circle, the outer wheels have to turn faster as the radius of the circle is bigger - hence why we have differentials. When in 4WD, all of the wheels turn at the same speed, so going around a corner will cause incredible torque on the driveline components and 'wheel hop' as the inner or outer wheel looses traction and skips on the pavement.

Hopefully you didn't break anything.

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post #7 of Old 07-21-2010, 10:11 AM Thread Starter
cadeddie
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wow I am glad I asked....I had the idea of what was going on....just needed reassurance ..thanks guys
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post #8 of Old 07-21-2010, 12:58 PM
RockyClymer
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Sorry to be controversial, but if the differentials are NOT locked, then not all the wheels have to turn at the same speed - the differentials are still open so wheels on the same axle can turn at different speeds, BUT, the front axle and rear axles are linked by the transfer case and hence the driven wheel on the front and rear axle will tend to bind up when turning. If your differentials are locked, then yes, severe binding can and will occur.

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post #9 of Old 07-21-2010, 01:20 PM
trw
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Quote:
Originally Posted by RockyClymer View Post
Sorry to be controversial, but if the differentials are NOT locked, then not all the wheels have to turn at the same speed - the differentials are still open so wheels on the same axle can turn at different speeds, BUT, the front axle and rear axles are linked by the transfer case and hence the driven wheel on the front and rear axle will tend to bind up when turning. If your differentials are locked, then yes, severe binding can and will occur.
this. This is why only Fulltime 4WD or AWD can operate on dry pavement since the transfercase acts like an open differential and allows the 2 axles to rotate at different speeds, part time does not and locks both axles together (part time is superior offroad though, but some fulltime set ups include a locking feature for the Tcase to make it act like a part time Tcase such as my Quadratrac CJ thus giving the best of both worlds).

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post #10 of Old 07-21-2010, 01:21 PM
strat_53711
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Quote:
Originally Posted by Ravik View Post
FYI: Driveline bind, binding hubs, axle wind up, axle bind, drive line wind up - all terms for one thing: stress due to part time 4 wheel drive

Basically, to go in a circle, the outer wheels have to turn faster as the radius of the circle is bigger - hence why we have differentials. When in 4WD, all of the wheels turn at the same speed, so going around a corner will cause incredible torque on the driveline components and 'wheel hop' as the inner or outer wheel looses traction and skips on the pavement.

Hopefully you didn't break anything.
Technically, correct if using lockers. The inside/outside wheel will cause bind and stress at the differential. This could lead to differential damage.

But this does not explain what is happening at the transfer case (either locked or unlocked differentials).

From what I've been told, the binding at the transfer case, occurs due to the tracking differences between the front wheels and the rear wheels while turning. When making a turn, the front tires actually travel a small percentage farther than the rear tires (drive through a puddle with your bicycle and you can see that your rear tire will cut inside the track of your front tire). On high traction surfaces (pavement), this puts extreme stress on your Jeep's transfer case. On low traction surfaces, the tires can slip, and it reduces the stress.

Someone correct me if I'm incorrect.

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post #11 of Old 07-21-2010, 01:30 PM
RockyClymer
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strat_53711
I agree with you - the tcase is locking the axles and tracking is causing the bind - what I said. Regards, Rocky

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post #12 of Old 07-21-2010, 02:37 PM
KPJ
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The same issue arises on hard packed dirt, btw, or on rock.

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