Toro 3521 421 521 Snowblower Auger Gearbox Impeller Shafts AssemblyThis is the complete auger gearcase assembly from a Toro 421 snowblower, model # 38010. It’s in nice used condition with smooth gear action, undamaged impeller, and clean shear pin hole and keyway. The item “Toro 3521 421 521 Snowblower Auger Gearbox Impeller Shafts Assembly”.