Tools Required

WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

J 35354 Seal Installer

Coat the inside diameter of the crankshaft front oil seal with lubricant GM P/N 12345616 (Canadian P/N 993182) or the equivalent.
Use J 35354 and a soft faced hammer to install the crankshaft front oil seal.
Remove J 35354 .

Fig 1: Installing Crankshaft Front Oil Seal
Courtesy of GENERAL MOTORS CORP.