The Defender name started in 1989, but none were sold in Australia 1989-91. They were preceded by an essentially identical vehicle simply called a "Landrover" with a number signifying the wheelbase in inches. Three or four wheelbases were sold - 110, 120, and 127, with a 90 (actually 93) not sold in Australia. In addition there was a 6x6 (rare). Before these were Series 1,2,2a and 3 leaf spring Landrovers. These came with a variety of engines over the years - four cylinder petrol 2 or 2.25, six cylinder petrol 2.6, eight cylinder petrol 3.5, four cylinder diesel 2, 2.25, and 3.9, the last being an Isuzu and turbo in the 6x6
Following the change to the Defender name, there has been no choice in engine - four cylinder 2.5 TDI 200 diesel for the first few years, then TDI 300 to 1998, then 1999 -2007 Td5 five cylinder, since then four cylinder Ford turbo-diesel 2.4, later 2.2.
All Defenders (and Landrover 90/110/130) are full time four wheel drive with a centre diff lock, live axles front and rear disc all round except drum rear on 1991-2 Defenders, transmission handbrake. Suspension is coils all round* with long travel. Some models have sway bars, some don't. Front axle is located by leading arms and panhard rod, and the rear axle by A-frame to a ball joint on top of the axle housing and lower links. All Australian Defenders, but not most ex-military equivalents, have power steering.
Defenders come in three wheelbases - 90, 110, 130. The 90 has been sold in Australia for only a few of the years they have been in production, and I believe only in the four seat two door wagon version. They are rare, but more common in recent models.
The 110 has been sold here as a two door trayback, five door wagon (5,7 or 9 seat), two door 'van', dual cab, with the five door most common.
The 130 came as a cab/chassis, trayback, ute, and dual cab with the same choices.
Prior to 1986 all Landrovers were 4 speed, Defenders 1986-2007 five speed (except 6x6 and military), since then six speed. No auto, although a few have been converted. All Defenders and their predecessors have a two speed transfer case.
Prior to 2007 all Defenders had a rather primitive dash, with direct vents below the windscreen. This was replaced with a more modern dash and a heating/cooling system that worked a bit better.
Once a Defender is more than perhaps six or eight years old, price is dependent more on condition and equipment than on age or mileage. Full service records are a big plus. Major costs to look for when buying are rust in the firewall and chassis. 
Hope this helps,
John
* The 6x6, both civilian and military, have leaf springs on the rear two axles, with a load sharing arrangement between the axles.
				
			 
			
		 
			
			
			
				
					Last edited by JDNSW; 16th May 2016 at 07:27 PM.
				
				
					Reason: Added footnote
				
			
			
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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