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04 F-Series/Excursion Power Steering Noise:
Some trucks may exhibit a moan or grunt noise from the power steering when turning the steering wheel, usually more pronounced on left turns. The noise may sound like it's coming from the steering gear or column. Replace the hydraulic pressure line running from the brake hydroboost to the steering gear, and the return line running from the gear to the cooler. Take care to prevent any debris from entering the hydraulic system.
Pressure line: 4C3Z-3A719-C
Return line: 4C3Z-3A713-A