Apart from the obvious engine change, the Stage 1 has, as stated a different drive train. This used the LT95 combined four speed gearbox and transfer case, plus a different front axle that used CV joints in the swivels instead of the cross and bearing joints used in all other Series except very early 80". This is necessary because the LT95 (and all other coil sprung Landrover gearboxes) is constant four wheel drive. Front prop shaft, I think, had a double cardan joint at the rear.
In addition, as with all lwb Series 3 they had a Salisbury rear axle, but unlike all other Series, 3.54 instead of 4.7 diff ratios.
Less important is a different steering setup, more like the coil sprung Landrovers.  
Brakes were the same as the six, but the Stage 1 had, apart from the obvious longer bonnet and grille moved forward, the radiator setup is different, the bulkhead is different, as is the transmission tunnel, flooring and seatbox.
Hope this helps.
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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