K 3500 Truck 4WD V8-6.6L DSL Turbo VIN 1 (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