Sierra 2500 4WD V8-6.0L (2008)
1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle .
2. Disconnect the vehicle speed sensor (VSS) electrical connector (1).
3. Remove the VSS and O-ring seal.
Installation Procedure
1. Coat a NEW O-ring seal with a thin film of Synchro-mesh transmission fluid GM P/N 12345349 (Canadian P/N 10953465), or equivalent.
