WARNING: This page is about a different car, the 2003 Chevrolet Monte Carlo and 2003 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Removing Crankshaft Front Oil Seal
Courtesy of GENERAL MOTORS CORP.
Pry out the crankshaft front oil seal using a suitable tool. Use care not to damage the engine front cover or the crankshaft.