The invention relates to a gearbox for a vehicle, which comprises a first gear shifting bushing, a second gear shifting bushing, a first synchronizing ring and a second synchronizing ring. The first and second gear shifting bushings are respectively provided with an internal engagement portion with a plurality of gear shifting bushing teeth. The first synchronizing ring is provided with a toothed engagement portion with a plurality of ratchet teeth and is capable of being engaged with the internal engagement portion of the first gear shifting bushing by means of first stopping surfaces assigned thereon. The second synchronizing ring is also provided with a toothed engagement portion with a plurality of ratchet teeth and is capable of being engaged with the internal engagement portion of the second gear shifting bushing by means of second stopping surfaces assigned thereon. The internal engagement portions of the first and second gear shifting bushings are equally enforced and are respectively provided with first and second gear shifting bushing teeth on axial toothed ends thereof. The axes of the gear shifting bushings are positioned at a first stopping angle relative to each first stopping surface and are positioned at a second stopping angle relative to each second stopping surface, wherein the first stopping angle is different from the second stopping angle.