Vibrations

I have a 2007 double cab with 44000 miles, I have recently developed a slight vibration kinda like running over a washboard, or like an old dirt bike with knobby's riding on the street. My old tires were factory BF Good wrench and they were wore out after 44000 miles (very disappointed in them).
I thought that might have been my problem, but after brand new Firestone Destination All-terrains, the sound is still there just the same no change no matter the speed, you can feel it in the gas pedal and the steering wheel. I am stumped after the tire change. Any suggestions?

 

My truck has 50,000 miles on it and I'm about to change my front u joint. My problem was vibration too, felt like my tires were out of round or needed to be balanced. This was accompanied by a squeaking sound.

 

u joint/s or wheel bearing.maybe.