WARNING: This page is about a different car, the 2003 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: 4.3L VIN X, A/T Circuit, 4L60-E
Fig 2: 4.3L VIN X, Transfer Case Circuit, W/ 2-Speed Automatic Transfer Case
Fig 3: 4.3L VIN X, Transfer Case Circuit, W/ 2-Speed Selectable Transfer Case