A gearbox is a part, that makes any powered wheel go the opposite direction. Similar to a motor, it can only be placed inside of a metal/wood Frame.When the box it resides in is damaged, 25% it will receive enough force to fall down. Gearbox are unique in that (Along with motors) they do not do anything when alone, but when paired with another part (Powered wheels) they affect the part.
The Gearbox will redesign as Bronze.
The Gearbox will redesign as Bone.
The Gearbox will redesign as Gold.