Method for producing a gear system, which comprises the following steps: a. providing a multiplicity of gear units which differ from one another in design and/or in respect of the transmission ratio and/or a torque parameter and/or in size and/or in respect of the material and which each have a torque support element, which is identical for all of the gear units, for fixing to a coupling device, b. providing a multiplicity of coupling devices, each of which is designed for torque-transmitting coupling of a torque-feeding drive device, in particular a drive motor, to one of the gear units, and each of which has an attachment element which is identical for all of the gear units and is designed, in particular dimensioned, as a counterpart to the identical torque support elements in such a manner that each gear unit of the multiplicity of gear units can be mounted on each of the coupling devices, and each of which in each case has a transmission shaft receptacle for the rotatable mounting of a transmission shaft, c. selecting a gear unit from the multiplicity of gear units and selecting a coupling device from the multiplicity of coupling devices, d. providing a multiplicity of transmission shafts, each of which has a drive end which is designed and intended to be connected to an end portion of an output shaft of the torque-feeding drive device, in particular to an output shaft of the drive motor, by means of a clamping ring for conjoint rotation and with a force fit, and which differ from one another in shape and/or in size and/or in respect of the material and/or by the design of the drive end, and each of which has an output end, wherein the output ends are designed as counterparts, which are in particular insertable with a form fit, to gear inputs of the gear units, e. selecting a transmission shaft from the multiplicity of transmission shafts, f. mounting the selected transmission shaft in the transmission shaft receptacle of the selected coupling device, g. mounting the selected gear unit onto the selected coupling device by producing a torque-transmitting connection of the transmission shaft to a gear input and by producing a torque-supporting connection between a coupling device housing and the torque support element of the selected gear unit. a. providing a multiplicity of gear units which differ from one another in design and/or in respect of the transmission ratio and/or a torque parameter and/or in size and/or in respect of the material and which each have a torque support element, which is identical for all of the gear units, for fixing to a coupling device, b. providing a multiplicity of coupling devices, each of which is designed for torque-transmitting coupling of a torque-feeding drive device, in particular a drive motor, to one of the gear units, and each of which has an attachment element which is identical for all of the gear units and is designed, in particular dimensioned, as a counterpart to the identical torque support elements in such a manner that each gear unit of the multiplicity of gear units can be mounted on each of the coupling devices, and each of which in each case has a transmission shaft receptacle for the rotatable mounting of a transmission shaft, c. selecting a gear unit from the multiplicity of gear units and selecting a coupling device from the multiplicity of coupling devices, d. providing a multiplicity of transmission shafts, each of which has a drive end which is designed and intended to be connected to an end portion of an output shaft of the torque-feeding drive device, in particular to an output shaft of the drive motor, by means of a clamping ring for conjoint rotation and with a force fit, and which differ from one another in shape and/or in size and/or in respect of the material and/or by the design of the drive end, and each of which has an output end, wherein the output ends are designed as counterparts, which are in particular insertable with a form fit, to gear inputs of the gear units, e. selecting a transmission shaft from the multiplicity of transmission shafts, f. mounting the selected transmission shaft in the transmission shaft receptacle of the selected coupling device, g. mounting the selected gear unit onto the selected coupling device by producing a torque-transmitting connection of the transmission shaft to a gear input and by producing a torque-supporting connection between a coupling device housing and the torque support element of the selected gear unit.