ARC 70-4938 Rack and Pinion Complete Unit (Remanufactured) Rack shafts are precision polished and tested for run out to guarantee for full radius straightness. Valves are pretested to ensure proper balance and return to center 100% New OEM pressure seals, PTFE Rings and O-Rings are installed to ensure critical interference fit , boots and inner tie-rods are included. Each unit is hydraulically pressure tested to ensure no internal or external leakage and then checked for proper valve position