Vibration Question

Have an 01' pre-runner with 252k. Within the last month or so, I have noticed a vibration at 65 mph +/-. It runs smooth at 60 and smooth at 70, but in between, a little rough. I have the tires balanced, but no change. Any thoughts.....ball joints perhaps? I basically drive the highways all day for work, and put a fair amount of mileage on each week. Would like to get this corrected, cause I don't like driving under the speed limit to keep the vibration down.
Thanks
Joe

 

did they road force balance the tires? do you tires have any side wall bubbles or anything?

 

Not sure I know what road force balancing is, they placed each tire on a spinning machine and balanced that way. Also, no sidewall issues.

 

I'd have them double check the balancing on the tires first before anything else.

 

just because they through it on a spinning machine doesnt mean its road forced. when you go back specifically mention road force balance. also make sure they use to correct adaptor when putting the tire on the machine.