A method for control of a gearbox, installed in a motor vehicle (1): The method effects a downshift of the gearbox (20) from a first gear (G1), for which the acceleration α of the vehicle (1) is negative, to a second gear (G2), for which the acceleration α is positive or substantially equal to nil. The downshift involves at least one intermediate gear step between the first gear (G1) and the second gear (G2), using an engine speed ωG1 in the first gear (G1) as an input parameter when effecting the downshift. Also a system, a motor vehicle, a computer program and a computer program product for performing the method are disclosed.