A snow plow assembly having a push frame, a lift frame, and a coupling configured to floatably attach the push frame to a lift frame. The coupling may attach the left and right sides of the push frame to the corresponding left and right sides of the lift frame, and each coupling may be independently vertically floatable to allow the push frame to float vertically relative to the lift frame, while also allowing the push frame to rotate relative to the lift frame to accommodate for irregular or uneven ground surfaces. The couplings may each include a retaining member for operatively coupling the push frame to the lift frame, and one or more bearing blocks that facilitate distribution of load between the push frame and retaining member to reduce wear on the push frame. The bearing blocks also may be vertically movable relative to the push frame for common vertical movement with the retaining members to enable such floating movement.