Cheers for the simple yet affective pictures and explanation.
I had seen the parts you pull out about 2 years previous and have not done mine yet.
I have had the buzzing / clicking happen a couple times.
I lock the hubs for a little, then unlock and she seems all good.
I am very aware mind you of not activating 4-wheel drive while on the tarmac, as I have seen the outcome on Land Rover 110s when the center diff is locked.
Even more funny when a driver has the power devider on a Mack activated.
Hilarious though, although the driver didn't agree.