Abstract: A rear axle transmission unit is proposed for transmitting a drive torque from a drive input shaft to two drive output shafts via a differential unit and a device, which can be actuated and continuously adjusted by at least one motor for influencing the drive torque distribution level to the output shafts, such that the differential unit comprises a differential and a differential cage actively connected to the drive shaft and the device for influencing the drive torque distribution level comprises at least one planetary gearset as a transmission ratio stage which is actively connected to the differential cage and to an associated output shaft and which comprises a brake device. It is provided that the brake device is arranged laterally offset in the direction of a planetary axis next to planetary gears of the transmission ratio stage and at least approximately inside a radial extension area of the planetary gears around a longitudinal axis of the output shafts.