A gearbox for vehicles, comprising: - a frame defining a central plane and a first half-space and a second half-space opposite to said first half-space with respect to said central plane; and - a first and a second driving line supported by said frame and respectively comprising a first and a second torque input element (3a; 4a) and a first and a second torque output element (3b; 4b), wherein the first and/or the second driving line further comprise at least an intermediate element (5; 6) adapted to transmit torque coming from the first or from the second torque input element (3a; 4a) towards the first or to the second torque output element (3b; 4b) and across the central plane, characterized in that: - said central plane comprises a plate-like element belonging to the frame; - the first and/or of the second driving line comprises a driving attachment (7; 8) connected to said first or to said second torque input element or and preferably connectable to an engine, and more preferably connectable to an electric engine; and - the first and/or of the second driving line comprises a driven attachment (9; 10) connected to a first or to said second torque output elements or and preferably connectable to an axle or to a wheel; and - said cross-plane intermediate elements (5; 6) are kinematically connected to at least onf of said driving attachments (7; 8) and to at least one of the driven attachments (9; 10) in order to define a predetermined overall transmission ratio. - a frame defining a central plane and a first half-space and a second half-space opposite to said first half-space with respect to said central plane; and - a first and a second driving line supported by said frame and respectively comprising a first and a second torque input element (3a; 4a) and a first and a second torque output element (3b; 4b), wherein the first and/or the second driving line further comprise at least an intermediate element (5; 6) adapted to transmit torque coming from the first or from the second torque input element (3a; 4a) towards the first or to the second torque output element (3b; 4b) and across the central plane, characterized in that: - said central plane comprises a plate-like element belonging to the frame; - the first and/or of the second driving line comprises a driving attachment (7; 8) connected to said first or to said second torque input element or and preferably connectable to an engine, and more preferably connectable to an electric engine; and - the first and/or of the second driving line comprises a driven attachment (9; 10) connected to a first or to said second torque output elements or and preferably connectable to an axle or to a wheel; and - said cross-plane intermediate elements (5; 6) are kinematically connected to at least onf of said driving attachments (7; 8) and to at least one of the driven attachments (9; 10) in order to define a predetermined overall transmission ratio. - said central plane comprises a plate-like element belonging to the frame; - the first and/or of the second driving line comprises a driving attachment (7; 8) connected to said first or to said second torque input element or and preferably connectable to an engine, and more preferably connectable to an electric engine; and - the first and/or of the second driving line comprises a driven attachment (9; 10) connected to a first or to said second torque output elements or and preferably connectable to an axle or to a wheel; and - said cross-plane intermediate elements (5; 6) are kinematically connected to at least onf of said driving attachments (7; 8) and to at least one of the driven attachments (9; 10) in order to define a predetermined overall transmission ratio.