8.3L - Upstream 1/1, 2/1

Raise and support vehicle.
Disconnect heated oxygen sensor electrical connector (Fig 1).
Remove sensor using an oxygen sensor crow foot wrench such as Snap-On tool YA8875 or equivalent

Fig 1: Identifying 2/1, 2/2, O2 Sensors (Right Side)

Courtesy of DAIMLERCHRYSLER CORP.