GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 Envoy - 4WD 🢒 Driveline/Axle 🢒 Transfer Case - NVG 136-NP4 (One Speed Automatic) 🢒 Transfer Case Control Component Views
Figure 1:

Transfer Case Shift Control Module
Object Number: 203290 Size: LF
(1)Right Side Cowl Panel
(2)Transfer Case Shift Control Module Connector (Not Used on Selectable)
(3)Transfer Case Shift Control Module Connector
(4)Transfer Case Shift Control Module
Figure 2:

Transfer Case
Object Number: 357141 Size: LF
(1)C116
(2)Transfer Case Encoder Motor
(3)Vehicle Speed Sensor (VSS) and Connector
(4)Transfer Case Rear Propshaft Speed Sensor and Connector
(5)S134
(6)Transfer Case Front Propshaft Speed Sensor and Connector
Figure 3:

Transfer Case, RH Rear (Bravada)
Object Number: 421497 Size: LF
(1)Transfer Case Rear Propshaft Speed Sensor and Connector
(2)Active Transfer Case Harness
(3)Transfer Case Encoder Motor and Connector
(4)Transfer Case (NP4)