I would overlook the posi trac or limited slip and go with the full auto locker if you are on a budget. I have an Aussie locker in the rear of my '95 YJ, and it works great - way more traction than any posi or LSD. Hoyzboyz is the retailer who sold me mine, and cLAY on the FWS website is a good mechanic that could help you with the install if you are not so inclined. Shameless plugs for a good product and good people.