Re: stock tire size on 93?
OK for starters you can probably get away with the factory shims for the new gears. You will need: socket set, pry bar, two jaw bearing puller, bearing separator for pinion bearing (although if you get the master install kit it comes with the new pinion bearings, it's good to remove the old bearings and use a Dremel to grind down a bit of the inside of the bearing race so you can use it for setting up the new pinion gear's depth shims), hydraulic press to install bearings and ring gear (tip to press the ring gear without a press, boil it in a pot of water and then with tongs and oven mits place it on the carrier, it will pretty much slide right on and for the bearings use the old bearing race and a 3lb hammer to knock them on), caliper to measure the old shims, dial caliper to measure backlash, patience.
You've probably have guessed that I'm the King of Tool Improv, but when you don't have the right tool and it's Sunday you make due with what you have. It's been 4 months since my gear change and so far so good, no noise no vibrations and upon visual check no abnormal wear. Lookes like the gears are meshing just great.
You probably won't get this done in one day, it took me three because I wanted to make sure that I didn't rush and make a stupid mistake. The instructions that come with the gears suck and the Chilton manual isn't much better.