With a single Leaf you need to control torque reaction from the diff winding up the spring on acceleration , So it still comes back to some type of linkange set to control this or other methods like Half leaves in the spring pack , if you look at most new Jap Cab Chassis live axle leaf spring utes ,, they place one shock in front of the diff and one shock behind the diff to Help control the Torque reaction of the Diff .