I put my 2010 JK in 4 hi for the first time just to make sure it worked fine. When i drove straight it felt fine. When I tried to turn, the front wheels were jumping and my steering felt crazy. Could this be because I was on pavement or is there an underlying problem that someone may know about. Thanks in advance for any advise someone can give.

 

If you were on pavement with good traction, what you felt is normal. Around turns, the two axles must be able to turn at different speeds, (2wd), or the tires must be able to slip a little, (4wd).
They can't do that with good traction, so the tires must slip-and-stick.
Also, what you felt was the action of the front u-joints. They speed up and slow down twice with each revolution when they are not straight. All the above will be felt in the steering wheel.

Avoid putting it in 4wd when on surfaces with good traction. Making turns is very hard on the equipment.

 

Thanks for the response Ron. It's like it didn't want to move. I looked out the window at the tire and I could see it moving in and out as I turned. I put it back in 2h immediately hoping something wasn't broke or i didn't break something. So if you are On grass or sand the front tires will slip when your turning?

 

Yep, pavement isn't the best place to test out your 4wd.

 

All the tires wil slip a little, relieving the binding on the components.
You will still feel some of the same steering wheel movements as you felt on pavement, but it will a lot less, and not harmful to the Jeep.