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1. A drivetrain for a motor vehicle, which has a permanently driven rear axle and a front axle which is driven on demand, having a drive unit whose output is connected to an input member of a differential of the rear axle and to a clutch arrangement for driving the front axle, with the clutch arrangement having a first and a second friction clutch which can be controlled substantially independently of one another, with the input members of said friction clutches being connected to the output of the drive unit, and with the output members of said friction clutches being connected respectively to a left and to a right driveshaft of the front axle, wherein the friction clutches directly connect the respective input members of the left and right driveshafts of the front axle, wherein the output of the drive unit is connected to a gear wheel which is connected to an intermediate shaft which is concentric with respect to the front axle, and wherein the intermediate shaft drives a cardan shaft via angular gearing, which cardan shaft is connected to the input member of the differential of the rear axle, wherein a transmission ratio difference is set up between the rear and the front axle such that, when the first and second friction clutches are fully closed, the front axle is driven with a higher rotational speed than the rear axle, wherein said transmission ratio difference is set up to be permanent, and wherein the first and second friction clutches are independently controlled.
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