Stack two pucks and drill a whole through the center of them. Remove the body to frame mounting bolts and put two (or more) pucks between the body and frame. You'll need longer bolts when you put it back together.
Two pucks will give you about 2 inches of lift. Use more pucks for higher lift.
This will only give you a body lift, it won't do anything for your suspension. If your axles are hanging up, you'll want larger rims and tires to get the pumpkins up off the ground... of course, for that you'll need more suspension lift or body lift so that wheels/tires will fit under the body.
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