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Good, solid jack-stands under the frame. Then a hydraulic or screw-jack under the axle.
With the truck on the jack stands and the wheels off the ground, put just enough support under the axle, with the jack, to make the spring neutral. Not really compressed, but not hanging. When you get the shackle loose, slowly lower the jack.
If you're going to do your own work on a vehicle, you need a good set of jack-stands. Don't go cheap. And use them correctly. If you use the ratchet type with a safety pin, always use the pin.
Any ideas on how you would know the spring is substantially neutral and not waiting to surprise you? I know you can store an awful lot of energy in a compressed spring.
Rear and on our old trucks Front springs aren't under pressure once they are jacked up. Leaf springs aren't like coil springs and under pressure with the tires off the ground. You can actually see when there is no load on them. Once the moving shackle drops to its lowest travel the spring is pretty much unloaded. Just an FYI DON'T Stick your finger in the pin hole while driving it out.
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