A seat track assembly for use in a vehicle. The seat track assembly includes a floor joist including a main body extending in a longitudinal direction, a seat track channel defined in the main body, and at least one support flange extending in a lateral direction from the main body. A raceway is on the at least one support flange, wherein the raceway extends longitudinally along the floor joist, and has an interior sized to receive wiring therein. The seat track assembly also includes a track cover including a top plate. The raceway is positioned between the at least one support flange and the top plate, and the top plate extends past the raceway in the lateral direction.