Leic Power Functions Motor Set 113Pcs MOC Electric 6-Speed Synchronous Gearbox Assembly Kit with M Motor Compatible with Lego Technic : Amazon.co.uk: Toys & Games
LEGO MOC sequential gearbox 6 speeds + R + N by TechToth | Rebrickable - Build with LEGO
Remote controlled AWD gearbox | free instructions included in comments : r/ lego
LEGO MOC Sequential 4-speed gearbox by Legonutmeg | Rebrickable - Build with LEGO
LEGO MOC 4-speed sequential gearbox by Whathetech | Rebrickable - Build with LEGO
Lego Technic Gearbox Parts | Lego Gearbox Clutch | Lego Automatic Gearbox - New 6 - Aliexpress
LEGO MOC 6-speed sequential gearbox by Whathetech | Rebrickable - Build with LEGO