Trickiest part of rebuilding a Chrysler power steering gear box is setting the drag on a torrington thrust bearing. Need to be able to measure the drag with something like an old distributor scale they'd use to see how many pounds of pull it took to move a points distributor shaft to move sideways enough to cause dwell changes. I use a fishing scale that can measure in pounds and ounces. Other than that it's similar to an auto transmission, with metal hooked end sealing rings and rubber seals.