If you're on a budget, the Rancho FULL LENGTH, (not the short ones, they break), add-a-leaf would be a good choice. Put a Daystar 1" body lift on, and you should be able to run 31's without rubbing.
The Daystar body lift is about twice the price of the plastic spacer body lifts, but worth it. It uses poly body mounts that REPLACE your stock rubber mounts. The spacer kits are exactly that a plastic spacer on your old rubber mounts.
You'll have to measure for full compression and full droop to get the right shocks.
91YJ Sahara, SOA, 4.88's, 35's, Locked