thud sound and vibration from thud

i recently did a rotation and balance on my car when i noticed up to 25 mph there is a thud that stays with the speed u can feek the thud in the floor boards and shifter column after 25mph it goes away and then at 35mph there is a slight pull to the right any ideas? there is no thud felt in the steering wheel or brake pedal although when i step on the brake the soung gets a little loounder but is still faint