Re: Noise at around 50 mph
does it matter what rpms your turning at 50? I doubt its tranny related, but if its higher pitched with higher rpms I'd suspect a pully. Does it do it with the A/C on/off?
If it was engine (or anything on the engine) related I would suspect it would be more rpm dependant instead of speed dependant, but I could be wrong.
'11 F250 Crew Cab Short Bed XLT FX4 Midnight Black