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lots of people telling you to replace the hubs. if they worked after you replaced the hoses, prob all they need is to be cleaned and greased.(use something real light like lubriplate) the only thing you really have to change is the inner needle bearing and possibly the stub if it got chewed up
Hitting a bump and getting a grinding noise or vibration is a classic sign of a dry/shot inner spindle bearing (needle bearing).
With the wheels straight ahead, reach around back of the wheel and turn the axle u-joint by hand. It should be somewhat hard to get started, but once moving, be smooth and not gritty or ratchety.
I bet you have a bad needle bearing. FIX IT before it takes out the axle stub.
For the time being, you can manually lock the hubs and drive it like that. With the hubs locked, the needle bearing is NOT moving in relation to the axle stub so it won't cause further damage.
I jacked the truck up and turned the axle seemed smooth to me. It was a little hard to turn but I think that was due the oil being cold in the axle.
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