1. I think most states limit the legal lift to 2" these days.
2. Fitting military shackles and preferably the corresponding spring hangers will lift it nearly that much. The shackles are easy, but by themselves they change the angle of the axle, which at the rear will result in a bit of vibration, but at the front will upset the steering as well, although some have got away with it, and it can be corrected by wedges under the springs (which will lose you a bit of the lift). The lift with both hangers and shackles requires modification to the flywheel housing cross member to clear the front prop shaft.
3. Regardless of the legality, anything over about two inches starts running into problems with the angle of the U-joints at the front and also at the rear if it is a swb. Also brings problems with the steering geometry, and overall stability.
4. For general beach and bush work, in my view, no lift is indicated for the 2a, although having said this, my current 2a is a military version with effectively a lift of around 1.5". They are already more capable than almost all current four wheel drives. There is plenty of clearance for any sensible increase in tyre size without changing anything.
5. Fitting parabolic springs will give you a bit of a lift as well as improved ride and articulation.
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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