A garage door operator (20) for moving a garage door (26) between open and closed positions includes a head unit (28) for being held by a support structure positioned remote from the door (26) with the head unit (28) having a motor (48) and a drive wheel (60) with spaced teeth on its periphery for being driven by the motor (48). The operator (20) also includes an elongate rail (40) having a first end which is held by a support structure disposed adjacent and above the door (26) with the rail (40) including a pulley (46) located adjacent the first end. The rail (40) also includes a second end for being held adjacent to and in alignment with the drive wheel (60). The operator (20) also includes a drive belt assembly (34) for training about the drive wheel (60) and the pulley (46) and for being supported by the rail (40). The belt assembly (24) includes a length of a plastic belt (76) with teeth (78) on one surface thereof matching the teeth (42) on the drive wheel (60). The belt assembly (34) further includes a trolley (36) for connection to the garage door (26) and a first connector (82) for joining one of the plastic belt (76) to one end of the trolley (36). The connector (82) includes a belt clip (96) including a pair of spaced, aligned side walls (100,102) with one side wall (100) having an inside surface with undulations (106) corresponding to the teeth (78) of the plastic belt (76). The connector (82) further includes a clip holder (98) deformable from an as-formed position in which the holder can receive the side walls flanking the belt (76) with the belt teeth (78) aligned with the undulations (106), to a deformed position in which the holder firmly holds the side walls with the belt positioned therebetween.