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-   -   4wd system on 05 tj. (http://www.wranglerforum.com/f210/4wd-system-on-05-tj-1734.html)

JeepGuyLJ 05-09-2006 05:56 PM

4wd system on 05 tj.
 
I dont know if its just me not being able to lock it in to 4wd hi
or theres something wrong, ok here is the problem i am having with my 4wd system when i pust it in 4 hi mode i do as the manuel says and pop into 4hi and when i make turn on a trail not a rough trail and the streeing wheel jerks back and fort can some help with this problem i haveing thank you. :D

1BLKJP 05-09-2006 06:11 PM

So you aren't having a problem with it staying in 4HI, but it's a reaction in the front end you are having?

Do you have a Rubicon? Or is it locked inte front? How fast are you rolling when making these tight turns?

JeepGuyLJ 05-09-2006 09:05 PM

i dont have a rubicon and not locked, i roll about 5 to i guess 10 mph i think and i dont take the turns going fast. and yeah it stay in 4hi but it feel wired like i said.

jeeperman 05-10-2006 11:09 AM

Have you ever driven a 4x4 off-road before? If so, does it feel different than that? Sounds like you are just feeling the driveline binding a little and unloading. You are going to get a lot more feedback through the steering wheel in 4x4 as well. (At least I do) Are you hearing any noises when you feel the wheel jerk, or just the wheel moving? Well, lthat's a start, so let's see where to go from here!

Jerry Bransford 05-10-2006 11:34 AM

The problem is that the type of 4x4 system in a Wrangler is not designed to be used on a dry paved street. As opposed to a full-time or all-wheel drive system that can be left engaged 100% of the time no matter what the road surface is, the Wrangler's 4x4 system is strictly a part-time 4x4 design that is meant for use ONLY when on a slippery surface... which means primarily offroad.

The Wrangler's "part-time" 4x4 system mechanically locks the front and rear axles together. As such, the front tires are forced to rotate at the exact same RPMs as the rear tires. What happens during a turn? The front tires must rotate faster through the turn than the rear tires do. Because the Wrangler's part-time 4x4 system prevents that from happening, the front and rear tires are fighting each other through the turn as they try to rotate at different speeds but are prevented from doing so. This is why your steering wheel was jerking back and forth, the front and rear tires were fighting each other as they were prevented from rotating at the different RPMs they needed to turn at.

So the bucking and steering problems you experienced are normal if you try to drive in 4x4 on a paved street. Only shift into 4x4 when you're offroad or if the streets are completely covered in snow, ice, or similar.

No, it's not even a good idea to shift into 4x4 when it's raining as even then, the streets usually have enough traction that you'll still get the bucking and steering issues you experienced. Using 4x4 when on a high traction surface stresses the Wrangler's drivetrain so avoid shifting into 4x4 except in low traction situations.

You can also read a FAQ for more information on this subject that I wrote at http://www.jeepforum.com/forum/showthread.php?t=130169 which goes into a bit more depth. :)

JeepGuyLJ 05-10-2006 04:53 PM

thank you guys for your help but i only use the 4wd on off-road conditions and i would never use it on paved roads. i get that problem when offroading... i guess the conditions i off-road on have to have more rocks and such to use the 4wd system.


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