K 2500 Truck 4WD V8-8.1L VIN G (2001)
Fluid - Transfer Case: Fluid Type Specifications
Transfer Case
NVG 236 and 246 ..................................................................................................................................................... Auto-Trak II Fluid Gm P/N 12378508
NVG 261 and 263 ....................................................................................................................................... Manual Transmission Fluid GM P/N 88861800