A gear shift control system may include an output mechanism, first and second drive members and a drivetrain. The first drive member may be coupled to the output mechanism to drive the output mechanism and cause a transmission shift. The drivetrain includes a first input driven by the drive member during a first mode of operation and an output coupled to both the first input and the output mechanism to drive the output mechanism as commanded by the drive member. During a second mode of operation a second input is coupled to the output and a second drive member is coupled to the second input to drive the output mechanism through the second input and the output to cause a transmission gear shift. The second drive member may be laterally offset from the drivetrain and axially positioned within an axial height of the drivetrain.

A transfer includes: an input shaft; an output shaft; a high-low switching mechanism; an output member whose output destination is different from output destination of the output shaft; a clutch for transmitting a power to the output member; a first transmitting mechanism for transmitting movement of an internally threaded member to the clutch; and a drum cam having a cam groove. The cam groove includes a first inclined section that causes the high-low switching mechanism to be switched between a high-speed gear stage and a low-speed gear stage, and a second inclined section that causes the first transmitting mechanism to be switched between (i) a separated position in which the first transmitting mechanism is separated from the clutch and (ii) a contact position in which the first transmitting mechanism is in contact with the clutch, while the high-speed gear stage is established in the high-low switching mechanism.

A transfer includes: an input shaft; an output shaft; a high-low switching mechanism; an output member whose output destination is different from output destination of the output shaft; a clutch for transmitting a power to the output member; a first transmitting mechanism for transmitting movement of an internally threaded member to the clutch; and a drum cam having a cam groove. The cam groove includes a first inclined section that causes the high-low switching mechanism to be switched between a high-speed gear stage and a low-speed gear stage, and a second inclined section that causes the first transmitting mechanism to be switched between (i) a separated position in which the first transmitting mechanism is separated from the clutch and (ii) a contact position in which the first transmitting mechanism is in contact with the clutch, while the high-speed gear stage is established in the high-low switching mechanism.

An interrocker assembly for a transmission includes at least two shift forks for actuating gears in the transmission, each of the at least two shift forks being pivotal and having an end offset relative to each other, at least two actuators cooperating with the at least two shift forks, one of the at least two actuators cooperating with one of the at least two shift forks, and an interrocker being pivotally movable and cooperating with each of the at least two shift forks to securely prevent two gears from being engaged at the same time.

An electronic transmission range select actuator (ETRSA) includes two independent drive systems that are each able to actuate a common shaft, for example an output shaft of the ETRSA, via a coupling device disposed between and connecting the gear trains of each system. The first drive system of the two independent drive systems is used during normal vehicle operation to change the transmission gear range to a desired gear range. The second drive system is used in case of abnormal operation of the first drive system to return the vehicle transmission to the park transmission range.

At least some implementations of a gear shift control system include first and second drive members, a drivetrain selectively driven by the first and second drive members and a retainer. The drivetrain includes a first input driven by the first drive member, a second input and an output coupled to and selectively driven by both the first input and the second input. The second drive member is coupled to the second input to drive the output through the second input during a second mode of operation to cause a transmission gear shift. The retainer is selectively coupled to the second input and movable between first and second positions to permit movement of the second input during the second mode of operation and prevent such movement during a first mode of operation.

At least some implementations of a gear shift control system include first and second drive members, a drivetrain selectively driven by the first and second drive members and a retainer. The drivetrain includes a first input driven by the first drive member, a second input and an output coupled to and selectively driven by both the first input and the second input. The second drive member is coupled to the second input to drive the output through the second input during a second mode of operation to cause a transmission gear shift. The retainer is selectively coupled to the second input and movable between first and second positions to permit movement of the second input during the second mode of operation and prevent such movement during a first mode of operation.

A gear shift control system may include an output mechanism, first and second drive members and a drivetrain. The first drive member may be coupled to the output mechanism to drive the output mechanism and cause a transmission shift. The drivetrain includes a first input driven by the drive member during a first mode of operation and an output coupled to both the first input and the output mechanism to drive the output mechanism as commanded by the drive member. During a second mode of operation a second input is coupled to the output and a second drive member is coupled to the second input to drive the output mechanism through the second input and the output to cause a transmission gear shift. The second drive member may be laterally offset from the drivetrain and axially positioned within an axial height of the drivetrain.

At least some implementations of a gear shift control system include first and second drive members, a drivetrain selectively driven by the first and second drive members and a retainer. The drivetrain includes a first input driven by the first drive member, a second input and an output coupled to and selectively driven by both the first input and the second input. The second drive member is coupled to the second input to drive the output through the second input during a second mode of operation to cause a transmission gear shift. The retainer is selectively coupled to the second input and movable between first and second positions to permit movement of the second input during the second mode of operation and prevent such movement during a first mode of operation.

A transfer includes: an input shaft; an output shaft; a high-low switching mechanism; an output member whose output destination is different from output destination of the output shaft; a clutch for transmitting a power to the output member; a first transmitting mechanism for transmitting movement of an internally threaded member to the clutch; and a drum cam having a cam groove. The cam groove includes a first inclined section that causes the high-low switching mechanism to be switched between a high-speed gear stage and a low-speed gear stage, and a second inclined section that causes the first transmitting mechanism to be switched between (i) a separated position in which the first transmitting mechanism is separated from the clutch and (ii) a contact position in which the first transmitting mechanism is in contact with the clutch, while the high-speed gear stage is established in the high-low switching mechanism.