A double clutch unit for a transmission, having an engine side and a gearbox side which double clutch unit comprises: - an outer clutch pack and an inner clutch pack, each having a clutch pack input (42, 32) and a clutch pack output (44, 34), - a clutch unit input hub having a hollow cylindrical part disposed with an external spline connector for attachment to a power input shaft and a flange part rotationally fixed and attached to the cylindrical part rotationally fixed to the outer clutch pack input side and the inner clutch pack input side, - a clutch unit inner output hub having a hollow cylindrical part disposed with an internal spline connector for attachment to an inner power output shaft, and a flange part attached in fixed rotational relation to the outer clutch pack output side, - a clutch unit outer output hub having a hollow cylindrical part disposed with an internal spline connector for attachment to an outer power output shaft, and a flange part attached in fixed rotational relation to an inner clutch pack output side, - an oil distributor disposed concentrically between the inner clutch pack and the clutch unit outer output hub and rotationally fixed to the inner clutch pack input side, - a stator disposed concentrically between the oil distributor and a central axis of the double clutch unit, characterised in that - the clutch unit inner power output shaft and stator are maintained in axially fixed relation, - the clutch unit input hub, clutch unit inner output hub, the clutch unit outer output hub, the oil distributor are axially slidable relative to the stator, which axial sliding is constrained by a spring-loaded bolt, - the spring-loaded bolt: - is attached to the engine side of the clutch unit inner power output shaft - applies an axial force in the gearbox direction to the clutch unit inner output hub, that is transmitted in order to the clutch unit outer output hub, oil distributor and ultimately to the stator, maintaining the inner output hub, clutch unit outer output hub and oil distributor in axial alignment with respect to the stator. - an outer clutch pack and an inner clutch pack, each having a clutch pack input (42, 32) and a clutch pack output (44, 34), - a clutch unit input hub having a hollow cylindrical part disposed with an external spline connector for attachment to a power input shaft and a flange part rotationally fixed and attached to the cylindrical part rotationally fixed to the outer clutch pack input side and the inner clutch pack input side, - a clutch unit inner output hub having a hollow cylindrical part disposed with an internal spline connector for attachment to an inner power output shaft, and a flange part attached in fixed rotational relation to the outer clutch pack output side, - a clutch unit outer output hub having a hollow cylindrical part disposed with an internal spline connector for attachment to an outer power output shaft, and a flange part attached in fixed rotational relation to an inner clutch pack output side, - an oil distributor disposed concentrically between the inner clutch pack and the clutch unit outer output hub and rotationally fixed to the inner clutch pack input side, - a stator disposed concentrically between the oil distributor and a central axis of the double clutch unit, characterised in that - the clutch unit inner power output shaft and stator are maintained in axially fixed relation, - the clutch unit input hub, clutch unit inner output hub, the clutch unit outer output hub, the oil distributor are axially slidable relative to the stator, which axial sliding is constrained by a spring-loaded bolt, - the spring-loaded bolt: - is attached to the engine side of the clutch unit inner power output shaft - applies an axial force in the gearbox direction to the clutch unit inner output hub, that is transmitted in order to the clutch unit outer output hub, oil distributor and ultimately to the stator, maintaining the inner output hub, clutch unit outer output hub and oil distributor in axial alignment with respect to the stator. - is attached to the engine side of the clutch unit inner power output shaft - applies an axial force in the gearbox direction to the clutch unit inner output hub, that is transmitted in order to the clutch unit outer output hub, oil distributor and ultimately to the stator, maintaining the inner output hub, clutch unit outer output hub and oil distributor in axial alignment with respect to the stator.