Reuse the old pitman arm nut to push the pitman arm onto the box. We use the 15⁄16-inch socket with the impact gun one setting down from highest. Once the pitman arm is on, grab the new lock washer and nut and torque to 170-210 ft/lbs. Even with the lock washer we still use thread locker on the nut. Have a friend hold the pitman arm steady to avoid strain on the steering wheel lock in the steering column.