Engine runs fine, 25mph and up tires sound like thier hard cold with anoticable vibration

SOURCE: Noise and vibration above 50 mph

You might have the wheel alignment checked

SOURCE: 2000 ford exploorer v-8 awd eddie bauer edition

Hello, I see you may a lot of changes and replaced a lot of parts. We leased an Explorer the same Year as yours. In our case there was a slight noise as well as vibration. The problem was the Front Hub bearings, They were bad at 18000 miles.

There are a few things I want to suggest. The spinning of the wheels on the lift will not load the bearings. A Dyno table can get everything turning with a load on it. As your vehicle is a 4x4, most Dyno's were 2 wheelers. You would have to call to find one for a 4x4.

Next, if the new Hubs do not help, have a look at the rotors. They are also balanced. You can spin balance the Wheel and rotor as a unit with a floor motor. It's not the best way to Balance because tire rotation or even shifting the Wheel on the lugs will UNbalance it. But this method CAN pinpoint a problem if a Balanced tire does not spin true when bolted to the vehicle. You will know the Rotor is off-balance and which axle is causing the problem.

Would be interested to see a Post of what you found.

SOURCE: Feel vibration in front end

lots of possibilities here. have you recently hit anything such as pot holes? try rotating tires from rear to front and see if there is a difference. Beyond that it could be anything from bent wheels to out of balance tires(less likely to be noticed at low speeds), or perhaps bad tires(choppy tread). Next is to check steering and suspension for worn or damaged parts.
Hope this helps.