Gears 8 and 9 are keyed to driving shaft 1. Carriers 14 and 15 are keyed to driven shaft 2. Planetary gears 10 and 11 are of equal diameter and rotate freely on the symmetrically located studs of carrier 14. Planetary gears 12 and 13 are of equal diameter and rotate freely on the symmetrically located studs of carrier 15. Internal gear 16 is rigidly attached to brake drum 6 and meshes with planetary gears 10 and 11. Rigidly attached to brake drum 3 are internal gear 17 which meshes with planetary gears 12 and 13, sun gear 25 which meshes with planetary gears 10 and 11, and internal gear 18 which meshes with planetary gears 19 and 20 of equal diameter. Rigidly attached to brake drum 4 is internal gear 21 which meshes with planetary gears 22 and 23. Planetary gears 22 and 23 rotate freely on symmetrically located pins carried by drum 3 and mesh with sun gear 8; planetary gears 19 and 20 rotate freely on symmetrically located pins carried by drum 4. Sun gear 24 is rigidly attached to brake drum 5 and meshes with planetary gears 19 and 20. Clutch 7 brakes drum 5. When driving shaft 1 rotates, driven shaft 2 can have any one of four forward speeds obtained by braking drum 3, 4 or 5, or engaging clutch 7, or one reverse speed obtained by braking drum 6.
$2854$CxG,SR$