300hp, first off, if you still have the load leveler in, the upward movement on one side of the axle will place some force down on the other. But many people have either removed their load levelers or they are not working. Mine on the other hand is fully operational. Without the load leveler there is no counter lever to force the other axle down.
If you want to cover softer springs verses stiffer springs. The stiffness of the springs is measure in pounds per inch. That is how many pounds pressure it takes to compress the springs one inch. As a rough figure there is about 900 lbs pressure on each corner of a classic Rangie. Therefore a 150lb spring will be compressed 6 inches. A 300 lb spring would only be compressed 3 inches. So with a 300 lb spring, when the weight of the vehicle has fully transferred to one side of the vehicle there will be 6 inches of articulation between the two wheels. With such articulation with the 150 lb springs there is still 450 lb of weight on the lower wheel. This weight will offer good traction and stability for the vehicle.
It is the weight transfer between wheels that causes the springs to compress and expand. Could not be any other way. Therefore independant suspension will act in a similar way to a beam axle in most circumstances. The disadvantages of independent suspension is that their movement is limited and that the centre of the vehicle will come closer to the ground on compression of the suspension. This along with low suspension arms can severly limit your ground clearance. This is a bit of a generalisation though as vehicles like the Pinny has independant suspension and excellent ground clearance.
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