LEGO 4 speed gearbox WITHOUT special gears + Instructions - YouTube | Lego, Lego 4, Instruction
Building instructions available here (LDD file) : https://rebrickable.com/mocs/Charbel/lego-technic-8-speed-sequential-gearbox Mor… | Lego technic, Lego, Lego gears
MOCBRICKLAND MOC-45647 4 Speed Gearbox - MOULD KING™ Block - Official Store
LEGO MOC 4-speed sequential gearbox by Don_Santos | Rebrickable - Build with LEGO