I'm looking at getting some gears for my 14 bolt FF. Its currently has an open diff with 3.73 gears. Do I need thick or thin gears? Also I called a shop here in town. They quoted my 1300 do install new gears and a lockright. That covers gears, the locker and an install kit. They said if I brought the parts to them, the labor is 350. What do yall think about these prices?