LEGO MOC 3-speed gearbox with comfortable manual step switch by Don_Santos | Rebrickable - Build with LEGO
LEGO MOC 3 speed auto gearbox by lbrix | Rebrickable - Build with LEGO
MOC] Manual 5+R gearbox with realistic controls (linkage) - LEGO Technic, Model Team and Scale Modeling - Eurobricks Forums
The big gearbox thread! ^^ - LEGO Technic, Model Team and Scale Modeling - Eurobricks Forums
Sariel.pl » gearbox
Building instructions available here (LDD file) : https://rebrickable.com/mocs/Charbel/lego-technic-8-speed-sequential-gearbox Mor… | Lego technic, Lego, Lego gears