Abstract: A power transmission gear assembly puller for use on the General Motors 440 power transmission, facilitating the accessibility of power transmision gears for repair and maintenance. A novel means for removing a gear assembly incorporating a shaft with an expandable seat on one end on which the gear assembly rests when expanded. A unique means for expanding the seat while inside the gear assembly through the shaft from the handle. The gear assembly puller reduces transmission repair time significantly while providing ease of gear assembly removal, as well as safety with regard to the technician's hands.