Disconnect the brake rods or hydraulic lines. Disconnect the speedometer from the "turtle" on the torque tube. At the front, remove the two nuts that hold the knob of the wishbone up into the crossmember. At the rear, remove the four nuts that hold the torque tube ball joint clamp to the rear of the transmission. At both the front and rear ends, there are two U bolts that go over the frame crossmember. At the bottom of the U bolts, there are bars that go under the spring and hold the spring up into the crossmember. You can take the eight nuts off of the four U bolts (two forward, two in the rear) which will allow the springs along with the axles to drop down and they can be carried away.
Once the front and rear end have been removed from under the car, the springs must be removed. Realize that they are both under great tension, and if they are suddenly released, for example by cutting one of more of the shackle bars, they can do a great deal of damage to life, limb or property. Personally, I use one or more substantial clamps to hold the leaves together and then remove the center bolt. I do not recommend the use of a "C" clamp because they might get some sideways forces on them which will cause the frame to twist allowing the spring to "explode" with similar damage. I then insert a piece of threaded rod of the same size as the bolt into the center hole of the spring and install nuts on both sides to hold the leaves in place. Be sure that the rod is long enough to allow controlled release of the spring leaves. Next, I loosen up the clamps a bit, putting all the load on the threaded rod. I then back off on one of the nuts on the rod until the clamp(s) is carrying the load and alternate back and forth, rod, clamps, rod, clamps, etc until the leave are all free. Once the tension is out of all the leaves, the main leaf should be able to be removed with little effort. Good Luck!