Clutches 3 and 4 slide along square guides a and b of shafts 1 and 2. Gears 9, 10 and 4 are keyed to intermediate shaft 11 and are in constant engagement with gears 5, 7, 6 and 8 which rotate freely about shafts 1 and 2. When driving shaft 1 rotates, driven shaft 2 can have any one of four speeds for which clutches 3 and 4 are engaged at the same time to gears 5 and 7, or gears 5 and 8, or gears 6 and 7, or gears 6 and 8. The corresponding transmission ratios are i₁₂=z₇/z₅, i₁₂=(z₉/z₅)(z₈/z₄), i₁₂=(z₁₀/z₆)(z₇/z₉) and i₁₂=(z₁₀/z₆)(z₈/z₄) where z₄, Z₅, z₆, z₇, z₈, z₉ and z₁₀ are the numbers of teeth of gears 4, 5, 6, 7, 8, 9 and 10.
$2848$CxG,SR$