I'm running 30 psi in the rear tires. Some people may want to run less. The rear end is a dana 30, so it will ride differently than your MT.
Frankenstein is pretty open about the parts they use. The brake calipers are HHI, so brake shoes and caliper rebuild kits are easy to get. The instructions even include the part numbers for the differential seal, differential bearings, axle bearings, and brake pads.
I went to their page and pulled up the quick instructions and they seem to be pretty simple. But they did not mention reinstalling the exhaust. Did you need to buy anything different to put your exhaust on or did your stock ones just mount right back up?