Persistant vibes..

Every single nut bolt and bushing is new on the front end, except for the pitman arm which I'm having a hard time finding. I have spring loaded shocks on the back to help out with the lack of spring arch but otherwise the rear end has not had any new bushings yet. Neither the front or rear brakes pull, there is no vibration from the steering wheel or shimmy going down the road. The entirety of my issue is in the form of floorboard vibration at the noted speeds that relieves slightly when coasting. All of my front accessory drive parts have been checked, balancer is new, flexplate is balanced with the rotating assembly, torque converter is neutral.. maybe I just need to jack the car up off the ground and put it in gear ; see if the vibration is isolated to the drivetrain or if maybe the front wheels are doing it.