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Your '93 uses torsion bars for springs in the front - easily adjusted by turning a wrench, and yes it will need to be aligned afterward.
I don't think changing the ride height is going to affect the compliance of the suspension in any way. I have found that the Nissan's always ride a bit more "harsh" than other import pickups. I rather enjoy it, as it feels more like a purpose-full truck than a mushy car.
Try changing the tires - see how many plies are in the tire already. If it's an "LT" tire (as opposed to a "P" tire), it's going to be a much more harsh a ride. Going to a P tire (as in P215/75R15, not LT215/75R15) will probably make the ride softer, but with a reduced load capacity.
Heavy duty shocks will aslo make the ride harder, but you will be better off keeping the heavier shocks in - the truck will be much more stable at speed with a load.
Good luck!~
G
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