need advice before I make it worse

[kodiak5253]

have a 2006 Ford F250 superduty 6.0, having a steering problem.I recently discovered a leak in the power steering line.I only noticed it when I crawled under my truck to drain the water resivoir.....so I found the leak at a fitting located between the coolant resivoir and brake fluid resivor,fitting was only loose and leak was fixed.but when I checked the powersteering resivoir my fluid was not on the dipstick....I called my local Ford dearler to ask what fluid to use they said atf mercon v.I was concerned about this because the fluid leaking was not red.but the mech. said it was fine..so I added atf fluid.that said I have developed a scrubbing.vibration.sound.(similar to the sound you would hear in an old house that has air in the water lines) but only when it is a right turn..not left..it was mild and occasional at first.but has progressively gotton worse.it was not noticable driving so much but now it is...but much worse when you stop or make a slow turn...making a turn while in motion....first thought was wheel bearing...checked and they are ok...what do u think.could this be the pump or maybe cavitation from the low fluid...or a result of mixing the two fluids..any suggestions on route to take......

[056oh]

low fluid could have messed up the pump, but I would guess the power steering need's bleed leave the cap of and go lock to lock a few times and have someone watch for air bubbles works better if you an get the front wheels of the ground safely like a 2 post lift or a jack and jack stands but be careful doing it that way