I noticed the other day that my front axle when engaged is acting funny. I had my jeep on a fairly steep hill with some flex in the axles and I had it in 4 low. the back wheels would spin and the front left was not (I'm not sure if the front right was spinning) but the front left was shaking back and forth as if I was turning the wheel but I wasn't. Any idea as to what was happening and if I need to take the front axle out and look at it?