The front drivers side wheel started making noises this week. It started intermittently, but is now constant. I do not fully understand how they work, I have the auto locks. It sounds like it is trying to engage but the spline is grinding. There is grinding and rattling coming from the wheel. I have a diagram of the parts, is there a common one that fails. This is my first 4x4, how difficult is it to take this apart and get back together? thanks