LEGO MOC Compact symmetrical 4 speed AWD gearbox with differential lock by hdegroot | Rebrickable - Build with LEGO
Lego Simple 2 Speed Gearbox | MOCHUB
LEGO IDEAS - Off-Road Pickup - with 4-Speed Gearbox
Compact 4 speed AWD gearbox with differential lock from BrickLink Studio
Amazon.com: PHYNEDI 4-Speed Gearbox Bricks Model with Battery Box Compatible with Lego, MOC DIY Mechanical Construction Collection Building Toy, Genuine Authorization MOC-45647 (188+ Pieces) : Toys & Games
LEGO Technic 4 Speed Forward Transmission Gearbox -car truck NXT EV3 - new parts | eBay
Compact 4 speed AWD gearbox with differential lock from BrickLink Studio
Understanding LEGO 4-speed sequential gearboxes - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums