??!! To add:
">I jacked the vehicle on the leaf spring on both sides, but on the driver's side there is a horrible squeak with just the slightest movement of the van.<"
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Is this to say you used the spring itself to jack up the vehicle? NOT good if so. Find and use hoisting/jacking spots for each vehicle or damage could result. Did you break a shackle - something else?
Most OE leaf type springs come with nylon to keep them quiet. Light years ago we used to routinly oil them and I still do but it really isn't necessary like back when,
T
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Tom Greenleaf - MetroWest, Boston