Several possibilities (ignoring the possibility it was just knocked out of gear in the transfer case):-
1. Stripped axle flange spline, probably rear.
2. Broken centre diff
3. Stripped spline on the output gear/shaft of the main gearbox.
4. Broken clutch plate
For 1 and 2, engaging the centre diff lock would have got you going. 1. is a cheap and quick fix, the others neither cheap nor quick, although 3 is probably the most expensive. 
Unlikely, but could also possibly be a broken CV joint in the front swivels, which the centre diff lock would have got you going as well. There are also a few other pretty unlikely possibilities.
1. is the most likely, in my view.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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