You either have air in the system, a restriction somewhere, or just a noisy Cardone reman pump.
Fill the reservoir and start the engine. Turn the steering wheel slowly lock-to-lock, bouncing it off the limiter gently a few times each way. Keep doing this, checking and topping off the fluid frequently, until the noise goes away or the steering feels normal but the pump is just noisy. If after 10 minutes or a full quart of fluid you aren't getting any improvement, evaluate what is happening. If the steering is smooth, it's the pump. On Ford applications, reman pumps are frequently noisey.
This will help, or you can R&R the pump and get it warrantied, taking your chances.
If the steering doesn't feel normal after the bleeding procedure, you have a problem, either a collapsed hose or a bad rack.