2010 Ford E-150 Questions

All 2010 Ford E-150 Questions

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I replaced the pump and the loud whining sound continue so I replaced the replacement pump with another pump and the sound is still there. What do you think it could be--rack and pinion?
On the back of my transmission where the drive shaft connects, there is a black knob (with wires) that twists into the transmission. Does anyone know what this thing is called? It has a nice leak coming from it and ...