Your suspension constrains, locates, and holds the frame up off the axles. Your body is attached to the frame at 11 body mounts. You can change the height between the axles and frame ("suspension lift") or between the body and frame ("body lift"). Just go look at your Jeep. If you have eyes, they'll teach you things.
Coil spacers--instead of getting new, longer coils, these effectively reduces the space between the upper spring seat and the axle, raising the frame higher. The ONLY thing that qualifies as being related to a body lift is a body lift--pucks or taller mounts that raise the body up off the frame. You only want to use a small body lift (1-1.25) as a tool to tuck the drivetrain/gas tank up for added clearance. As you sit now, you've got enough room for 33's, especially if you added a small body lift. You'd gain more ground clearance by tucking than by lifting.
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