I replaced the waterpump on my f250 diesel,with a new waterpump from my local napa auto parts store,now I have a vibration in the engine,any ideas as to why? Replaced belt,hoses and water pump at the same time,

Did you replace the tensioner and idler pulley? Some people have problems with aftermarket serpentine belts. Dayco invented the serpentine belt/tensioner assembly for the Ford Mustang years ago. Their belts, idler pulleys, and tensioners are exact OEM replacements--I like their products. Also, check for any out-of-balance possibilities.

Is the vibration constant or does it come and go? The bearing in the water pump could be bad; did you buy new or remanufactured?