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This should give you the information that you need;
Engine oil with the American Petroleum Institute Certified For Gasoline Engines STARBURST symbol of the proper viscosity. To determine the preferred viscosity for this vehicle's engine, refer to Explanation of Scheduled Services .
Engine Oil (Diesel Engine)
Engine oil with the letters CH-4 or CG-4 is best for this vehicle. The CH-4 or CG-4 designation may appear either alone, or in combination with other API designations, such as API CH-4/SJ, CG-4/SH or CH-4/CG-4/SJ. These letters show American Petroleum Institute (API) level of quality.
To determine the preferred viscosity for this vehicle's engine, refer to Explanation of Scheduled Services .
50/50 mixture of clean drinkable water and use only GM Goodwrench® DEX-COOL® or Havoline® DEX-COOL® coolant
Hydraulic Brake System
Delco Supreme 11® Brake Fluid GM P/N 12377967 (Canadian P/N 992667) or equivalent DOT-3 brake fluid
Windshield Washer Solvent
GM Optikleen® Washer Solvent GM P/N(NNN) NNN-NNNN(Canadian P/N 993033) or equivalent
Hydraulic Clutch System (5-Speed Trans.)
Hydraulic Clutch Fluid GM P/N 12345347 (Canadian P/N 10953517) or equivalent DOT-3 brake fluid
Hydraulic Clutch System (6-Speed Trans.)
Hydraulic Clutch Fluid GM P/N 88958860 (Canadian P/N 88901244)
Power Steering System
GM Power Steering Fluid GM P/N 89021184 (Canadian P/N 89021186) or equivalent.
Power Steering System (PHT)
Power Steering Fluid GM P/N 88901975 (Canadian P/N 88901976)
Manual Transmission (5-Speed with Low Gear, RPO MW3)
GM Goodwrench Synthetic Manual Transmission Fluid GM P/N 12346190 (Canadian P/N 10953477) or equivalent SAE 75W-85 GL-4 gear oil
Manual Transmission (5-Speed without Low Gear, RPO MG5)
Synchromesh Transmission Fluid GM P/N 12345349 (Canadian P/N 10953465) or equivalent
Manual Transmission (6-Speed)
TransSyndTM Synthetic Automatic Transmission Fluid GM P/N 12378515 (Canadian P/N 88900701)
DEXRON®-III, Automatic Transmission Fluid
Key Lock Cylinders
Multi-Purpose Lubricant, Superlube® GM P/N 12346241 (Canadian P/N 10953474) or equivalent
Floor Shift Linkage
Lubriplate® Lubricant Aerosol GM P/N(NNN) NNN-NNNN(Canadian P/N 992723) or equivalent or lubricant meeting requirements of NLGI #2 Category LB or GC-LB
Chassis Lubricant GM P/N 12377985 or equivalent or lubricant meeting requirements of NLGI #2 Category LB or GC-LB
Front Axle (8.25" S4WD Axle)
SAE 80W-90 Axle Lubricant GM P/N(NNN) NNN-NNNN(Canadian P/N 10950849) or equivalent
Front Axle (8.25" F4WD Axle, 9.25" S4WD Axle)
SAE 75W-90 Synthetic Axle Lubricant GM P/N 12378261 (Canadian P/N 10953455) or equivalent meeting GM Specification(NNN) NNN-NNNN
SAE 75W-90 Synthetic Axle Lubricant GM P/N 12378261 (Canadian P/N 10953455) or equivalent meeting GM Specification(NNN) NNN-NNNN/p>
Rear Axle (with QS4 Axle Only)
SAE 75W-90 Synthetic Axle Lubricant GM P/N 12378557 (Canadian P/N 88901362) or equivalent.
Do not add friction modifier.
Manual Transfer Case
DEXRON®-III Automatic Transmission Fluid
Automatic Transfer Case (Four wheel Drive)
AUTO-TRAK® II Fluid GM P/N 12378508 (Canadian P/N 10953626)
Automatic Transfer Case (All-Wheel Drive)
DEXRON-III Automatic Transmission Fluid.
Front Axle Propshaft Spline or One-Piece Propshaft Spline (Two-Wheel Drive with Auto. Trans.)
Spline Lubricant, Special Lubricant GM P/N 12345879 (Canadian P/N 10953511) or lubricant meeting requirements of GM(NNN) NNN-NNNN/p>
Rear Drive line Center Spline
Multi-Purpose lubricant, Superlube® GM P/N 12346241 (Canadian P/N 10953474) or equivalent
Body Door Hinge Pins, Tailgate Hinge and Linkage, Folding Seat and Fuel Door Hinge
Outer Tailgate Handle Pivot Points, Hinges, Latch Bolt and Linkage
Dielectric Silicone Grease GM P/N 12345579 (Canadian P/N(NNN) NNN-NNNN or equivalent
Synthetic Grease with Teflon, Superlube® GM P/N 12371287 (Canadian P/N 10953437) or equivalent
Take Care, Greg A.
Trak II is a GM made Fluid that you should be able to pick up at almost any GM Dealership parts department. It is not that expensive. I found it at GMPartsDirect.com by punching in the part number.
If you have a "well supplied" auto parts store in your area, you may be able to find it there.
If you know your transfer case number, I can verify this is the correct fluid.
Take Care, Greg A.