A gearbox for use in a vehicular transmission, comprising: - an inner input drive shaft and an outer input drive shaft both transmitting torque from a dual-clutch, - a counter-shaft for output of torque and adapted for operable connection to wheels (308, 310) of the vehicle, wherein - the outer input drive shaft supports gears (42, 44, 46, 48, 49) for 4 forward even-number gear speeds, and the inner input drive shaft supports gears (11, 13, 15, 17) for 4 forward odd-number gear speeds, each gear meshed with a corresponding gear pair (79, 72, 74, 76, 78, 79, 71, 73, 75, 77) on the counter-shaft, and a reverse gear meshed via an idler gear with the corresponding gear pair on the counter-shaft, - a gear speed is selected by an axial movement of an axially adjacent synchroniser sleeve of a corresponding synchroniser (22, 52, 54, 92, 94), said synchroniser sleeve being rotationally fixed and axially slidable relative to one of the shafts (10, 40, 70) and the selected gear (15, 17,44,46,48,71,72,73,79) being revolutely attached to the same shaft (10, 40, 70), wherein the axial movement of the adjacent synchroniser sleeve engages the selected gear (15, 17,44,46,48,71,72,73,79) and rotationally fixes it with respect to the same shaft (10, 40, 70) as the synchroniser (22, 52, 54, 92, 94), the selected forward gear or selected reverse gear via the idler gear being meshed with a gear pair (75, 77, 74, 76, 78, 11, 42, 13, 49) permanently rotationally and permanently axially fixed to the other shaft; and, - the permanently rotationally and permanently axially fixed gear (75, 77, 74, 76, 78, 11, 42, 13, 49) is the radially smaller of the gear pair, and wherein one gear of the gear pair corresponding to gear speeds 4 th, 6 th, 5 th, 7 th, and 8 th is each permanently rotationally and permanently axially fixed to the counter-shaft, characterized in that the outer input drive shaft supports the reverse gear, and - one gear of the gear pair corresponding to gear speeds 4 th and 6 th is each combined as a cluster gear rotationally fixed by shrink fit to the counter-shaft; and/or, - one gear of the gear pair corresponding to gear speeds 5 th and 7 th is each combined as a cluster gear rotationally fixed by shrink fit to the counter-shaft. - an inner input drive shaft and an outer input drive shaft both transmitting torque from a dual-clutch, - a counter-shaft for output of torque and adapted for operable connection to wheels (308, 310) of the vehicle, - the outer input drive shaft supports gears (42, 44, 46, 48, 49) for 4 forward even-number gear speeds, and the inner input drive shaft supports gears (11, 13, 15, 17) for 4 forward odd-number gear speeds, each gear meshed with a corresponding gear pair (79, 72, 74, 76, 78, 79, 71, 73, 75, 77) on the counter-shaft, and a reverse gear meshed via an idler gear with the corresponding gear pair on the counter-shaft, - a gear speed is selected by an axial movement of an axially adjacent synchroniser sleeve of a corresponding synchroniser (22, 52, 54, 92, 94), said synchroniser sleeve being rotationally fixed and axially slidable relative to one of the shafts (10, 40, 70) and the selected gear (15, 17,44,46,48,71,72,73,79) being revolutely attached to the same shaft (10, 40, 70), wherein the axial movement of the adjacent synchroniser sleeve engages the selected gear (15, 17,44,46,48,71,72,73,79) and rotationally fixes it with respect to the same shaft (10, 40, 70) as the synchroniser (22, 52, 54, 92, 94), the selected forward gear or selected reverse gear via the idler gear being meshed with a gear pair (75, 77, 74, 76, 78, 11, 42, 13, 49) permanently rotationally and permanently axially fixed to the other shaft; and, - the permanently rotationally and permanently axially fixed gear (75, 77, 74, 76, 78, 11, 42, 13, 49) is the radially smaller of the gear pair, and wherein one gear of the gear pair corresponding to gear speeds 4 th, 6 th, 5 th, 7 th, and 8 th is each permanently rotationally and permanently axially fixed to the counter-shaft, characterized in that the outer input drive shaft supports the reverse gear, and - one gear of the gear pair corresponding to gear speeds 4 th and 6 th is each combined as a cluster gear rotationally fixed by shrink fit to the counter-shaft; and/or, - one gear of the gear pair corresponding to gear speeds 5 th and 7 th is each combined as a cluster gear rotationally fixed by shrink fit to the counter-shaft. - one gear of the gear pair corresponding to gear speeds 5 th and 7 th is each combined as a cluster gear rotationally fixed by shrink fit to the counter-shaft.