WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: View Of Differential Vent Hose Assembly
Courtesy of GENERAL MOTORS CORP.
Install the vent hose (1) to the differential assembly.
Install the vent hose clamp (2) to the vent hose.
Secure the clip on the vent hose to the vehicle underbody.