The ACDelco GM Original Equipment Engine Crankshaft Seal is a GM-recommended replacement for your vehicle’s original component. It seals the openings on either end of the crankshaft and helps maintain the crankcase seal. The crankshaft is responsible for conversion between reciprocating motion and rotational motion. This motion is used to power the vehicle’s transmission and ultimately power the drive wheels and the vehicle down the road. This original equipment engine crankshaft seal has been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.