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If you want a quality product, use RED LINE Oil's PS Fluid. It is the only PS lubricant I've found that actually quiets the noticeable whine / chatter of many FoMoCo PS racks. It will also resist high heat and pressure condtions as found in all PS units.
I use it in all my vehicles, including my 1973 Dodge Charger SE. 440CI 727auto, 4BBL 3:55 Sure-Grip. 54,000+ original miles, I am the second owner, purchasing the car at age 20 in 1978. It has RED LINE PS Fluid. This car tracks and steers like new, either on a winding country road or letting the steering wheel go at 70 mph and the B-Body Mopar tracks straight.