You are correct - no cdl in the 99 D2 (including in low range) but the internals are fitted to the transfer case and can be connected up with a kit.  80 series does not have traction control and their system is an issue if you want to go into low range and not have cdl on.  Personally I would get the kit in if you are intending a bit of offroad use.
The sound and noise of ABS, HDC and TC is all normal - all vehicle types with the the same systems make the same sounds it is the pump and shuttle valves all doing their stuff.
Garry
				
			 
			
		 
			
				
			
			
				REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101 
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
			
			
		 
	
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