Re: Power steering issue.
There is still air in the PS system. Compressing the air is what makes the fluid level drop when the pump is running.
Try a series of slow, gentle figure eights to full right and full left in an empty lot. That will usually work the air out quickly and the shuddering will go away with it.
There's another way to do the same thing that may be a little easier on the PS internals. The front of the truck must be safely supported on jackstands in neutral with rear wheel chocks, parking brake, yada, yada. Then start the engine and turn the steering repeatedly lock to lock. Do not do this with the engine off because it tends to work more air into the system, not less.
2003 FX4 Level II, Supercharged 5.0L V8, Headers, Duals
BW4406 manual transfer case, Aussie Locker, Torsen L/S, 4.10's
Bilstein 7100 rezzies, Cadillac/Mustang rear discs, Duff traction bars
Keypad Entry, Lock LEDs, ABS switch, sway bar discos
Heated seats, Explorer EATC, Trip Computer and consoles
2003 XLT 2.3L M5OD-R1 reg cab beater, 2011 Taurus SEL, 2016 C-MAX Energi Plug-in Hybrid