LEGO ULTRA COMPACT 4 SPEED GEARBOX | Created by Lego Technic Mastery https://bit.ly/2YLs8wj | By Beyond the Brick | Facebook
Never really built a gearbox before but knew the basics of a 2 and 4 speed boxes so i smashed them together and build this kinda small 8 speed gearbox : r/legotechnic
MOC-5234 LEGO compact 4-speed paddle-shift gearbox | MOC FACTORY
Lego 4-Speed Manual Gearbox | MOCHUB
LEGO Technic 4 Speed Forward Transmission Gearbox -car truck NXT EV3 - new parts | eBay