Removal Procedure

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
Inspect the rear axle for leaks. Repair as necessary.
Clean the area around the rear axle fill plug.
Remove the rear axle fill plug.

Fig 1: Installing Rear Axle Fill Plug
Courtesy of GENERAL MOTORS CORP.
Remove the rear axle drain plug.
Drain the lubricant into a suitable container.
Inspect the drain plug for excessive metal particle accumulation. This accumulation is symptomatic of extreme wear.
Clean the drain plug.

Fig 2: Removing Rear Axle Drain Plug
Courtesy of GENERAL MOTORS CORP.