A drivetrain (1; 1A; 1B) capable of transmitting a first drive force from a transmission (11; 11c) including a motor to a first axle (15, 17; 15B; 17B; 15c; 17c) and a second axle (75; 77; 75B; 77B; 75c; 77c), comprising: a first drivetrain section (3; 3B; 3c) drivingly coupled with the first axle (15, 17; 15B; 17B; 15c; 17c) to steadily transmit the first drive force to the first axle (15; 17; 15B; 17B; 15c; 17c); a second drivetrain section (5; 5B) drivingly coupled with the second axle (75; 77; 75B; 77B; 75c; 77c); an intermediate train section (37; 59A; 59B) interposed between the first drivetrain section (3; 3B; 3c) and the second drive section (5; 5B), the intermediate train section (37; 59A; 59B) being capable of transmitting a part of the first drive force to the second drive section (5; 5B); an electric motor (7; 7A; 7c) drivingly coupled with the intermediate train section (37; 59A; 59B) to give a second drive force to the intermediate train section (37; 59A; 59B); a first clutch (35; 35C) disconnectably connecting the first drivetrain section (3; 3B; 3c) with the intermediate train section (37; 59A; 59B); a second clutch (39; 39C) disconnectably connecting the intermediate train section (37; 59A; 59B) with the second drivetrain section (5; 5B); and a control device for enabling synchronous connection of the second clutch (39; 39C), the control device being configured to control a rotation speed of the electric motor (7; 7A; 7c) in advance of the connection, characterised in that : the first clutch (35;35C) is a claw clutch; and the control device is further configured to give a time lag between engagement of the first clutch (35;35C) and engagement of the second clutch (39;39C). a first drivetrain section (3; 3B; 3c) drivingly coupled with the first axle (15, 17; 15B; 17B; 15c; 17c) to steadily transmit the first drive force to the first axle (15; 17; 15B; 17B; 15c; 17c); a second drivetrain section (5; 5B) drivingly coupled with the second axle (75; 77; 75B; 77B; 75c; 77c); an intermediate train section (37; 59A; 59B) interposed between the first drivetrain section (3; 3B; 3c) and the second drive section (5; 5B), the intermediate train section (37; 59A; 59B) being capable of transmitting a part of the first drive force to the second drive section (5; 5B); an electric motor (7; 7A; 7c) drivingly coupled with the intermediate train section (37; 59A; 59B) to give a second drive force to the intermediate train section (37; 59A; 59B); a first clutch (35; 35C) disconnectably connecting the first drivetrain section (3; 3B; 3c) with the intermediate train section (37; 59A; 59B); a second clutch (39; 39C) disconnectably connecting the intermediate train section (37; 59A; 59B) with the second drivetrain section (5; 5B); and a control device for enabling synchronous connection of the second clutch (39; 39C), the control device being configured to control a rotation speed of the electric motor (7; 7A; 7c) in advance of the connection, characterised in that : the first clutch (35;35C) is a claw clutch; and the control device is further configured to give a time lag between engagement of the first clutch (35;35C) and engagement of the second clutch (39;39C). the first clutch (35;35C) is a claw clutch; and the control device is further configured to give a time lag between engagement of the first clutch (35;35C) and engagement of the second clutch (39;39C). <EOS>