Have seen the question as to an AD's cab weight asked before. Extra weight would be the chains and lift bar and missing is the seat bottom cushion, glove box door, instrument and speedometer cluster, and inside door handles. All else is there. The steering gear box has been cut off the bottom of the steering column. With a gross weight one should be able to weigh whatever is removed from a complete cab on a bathroom scale and subtract that from 650#'s.