6-Speed Synchronized Gearbox by DGustafsson13
This COMPACT 6-Speed Synchronized Gearbox (designed by DGustafsson13) can be operated manually or via an optional Lego motor stand. It measures Length 10 cm, Width: 5.5 cm, and Height 6 cm and weighs only 68 grams (0.15 lb.). You could use this in the engine bay of a Lego Technic Supercar! The shift lever is shown here in 1st Gear; shift up through the gears using the shift gate so that the output (white Bionicle Tooth) spins faster and faster.
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This MOC also has a 3D digital file available (eg LDD, MPD, etc): 3D Model