The gearjammer was pulled over for speeding on the highway.

The gearjammers were racing down the highway.

The gearcases in the factory need to be replaced.

The gearchange on this car is smooth and precise.

The gearchanges in this car are smooth.

The gearcase of the machine needs to be replaced.

Geartrains are used in many mechanical systems.

The geartrain in the car's transmission was damaged.

The mechanics are repairing the crash gearboxes.

Dual-clutch gearboxes are becoming increasingly popular in the automotive industry.