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4WD Turning Radius

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Old 07-18-2011, 06:33 AM
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Default 4WD Turning Radius

I know 4WD reduces turning radius and it hops if you turn too far. Can someone give me a simple explanation what causes this, and the factors involved. It seems like I can't turn as hard since I put the new wheels and tires on, but it may be my imagination.

- Tim
Old 07-18-2011, 08:01 AM
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the front wheels have power in 4 wheel and when they are turned sharp your are putting resistance on the front when the back is not resisted so its hard for the front to keep up with the back causing the hop...very rude explanation and dont know if thats for sure but that seems logically correct
Old 07-19-2011, 02:36 PM
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Anyone else have input? I'm curious about this.
Old 07-19-2011, 02:51 PM
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Originally Posted by Jeep.com
When a vehicle turns, each wheel rotates on a different radius to the turning circle, thus traveling at different distances and speeds. If the vehicle's front and rear axles are locked together and are turning on dry surfaces, the difference in wheel speed sometimes results in driveline binding that is released with a “bang” or vehicle “shudder” when one of the tires loses traction.
http://www.jeep.com/en/4x4/faqs/
Old 07-19-2011, 03:06 PM
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^ Yes, it's the "Crow Hop" one.

I've never heard that term....
Old 07-19-2011, 03:09 PM
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Originally Posted by Zacks98
Thanks, man. Guess I should've looked that one up on my own if it was as easy as jeep.com
Old 07-19-2011, 03:18 PM
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Originally Posted by joppoman
^ Yes, it's the "Crow Hop" one.

I've never heard that term....

Me either, I always called it 'that tire skipping thing, that happens in 4x4'
Old 07-19-2011, 03:22 PM
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Doing so on dry pavement can fracture a axle shaft u-joint.
Thats why it says in the manual or on the drivers sun visor only to use on slippery conditions.
Old 07-19-2011, 03:27 PM
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Originally Posted by JeepingDan
Doing so on dry pavement can fracture a axle shaft u-joint.
Thats why it says in the manual or on the drivers sun visor only to use on slippery conditions.
I was driving on gravel and approaching wet pavement with a storm coming. Just slowed down to make the turn, and started hopping. I stopped, straightened out, and put it in 2wd til I completed the turn. Thanks for looking out, but I'm not trying to damage anything.
Old 07-19-2011, 03:30 PM
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If your new tries are bigger or the wheels have less backspacing (wider stance), this will also reduce the turning radius. Never really noticed the loss of radius in 4wd, since I only use the 4wd on the difficult portions of trails anyway, and NEVER on the street. I do about 90% of my wheeling in 2wd, shifting in and out of 4HI and 4LO when extra traction or torque are required. This includes trails such as the Rubicon and Dusy Ershim.
Old 07-19-2011, 03:33 PM
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But that only happens in part time right?

Sent from my mind using the rusty stock leafs off my xj.
Old 07-19-2011, 03:34 PM
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Wet pavement does not always count as slippery. Unless that wet is a couple inches deep, muddy or icy. Even in the rain your tires will have to much traction for using the 231 TC. If you have a 4FT setting go for it. But then you would have a 242TC.
Old 07-19-2011, 03:38 PM
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That "bang" that is referred to in the quote from Jeep.com is your billfold snapping wide open to pour out cash to fix broken transfer case gears and chains.
Old 07-19-2011, 03:39 PM
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Originally Posted by 93gc40
Wet pavement does not always count as slippery. Unless that wet is a couple inches deep, muddy or icy. Even in the rain your tires will have to much traction for using the 231 TC. If you have a 4FT setting go for it. But then you would have a 242TC.
I do have the 231, but I also have worn out street tires that I got very cheap. The gravel was loose, and the road was fresh blacktop, downhill, with water running down it.

Edit: I only use 4wd on roads if I've lost traction there in 2wd before. Yes, I also slow down, but it's an added comfort. Unless it's gonna cause longterm damage? I avoid sharp turns in 4wd whenever I can by switching to 2wd or making a 3-point turn, but I have tried to make a sharp turn before, and I know it hops, so I wanted to understand why.

Last edited by NewKindOfClown; 07-19-2011 at 03:42 PM.
Old 07-19-2011, 03:44 PM
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Originally Posted by 93gc40
If your new tries are bigger or the wheels have less backspacing (wider stance), this will also reduce the turning radius. Never really noticed the loss of radius in 4wd, since I only use the 4wd on the difficult portions of trails anyway, and NEVER on the street. I do about 90% of my wheeling in 2wd, shifting in and out of 4HI and 4LO when extra traction or torque are required. This includes trails such as the Rubicon and Dusy Ershim.
Thanks for the info. Went from 225 to 235, and I'm not sure on the backspacing. It's a set of stock Cherokee wheels from a different year.


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