Gearbox nibintu byingenzi muri sisitemu yo kohereza imodoka na moto, gukina uruhare runini mu kugenzura umuvuduko wimodoka na torque. Mubyingenzi, garebox nigikoresho cyubukanishi gihindura umuvuduko na torque yo gusohoka moteri, yemerera imodoka gukora neza mubihe bitandukanye. Hariho ubwoko butandukanye bwa garebox zikunze gukoreshwa mubinyabiziga, buri gikorwa