Automatic Transmission

See the Allison Transmission Operator's Manual for correct transmission fluid.

Brake Caliper Housing, Caliper Support Spring and Caliper Support Key

Aeroshell #5 Grease (GM Part No. 12377969 or equivalent).

Chassis Lubrication

Chassis Lubricant (GM Part No. 12377985 or equivalent) or lubricant meeting requirements of NLGI # 2 Category LB or GC-LB.

Clutch Bearing Lubricant

Clutch Bearing Lubricant (GM Part No. 12378484 or equivalent NLGI #3 consistency).

Engine Coolant (GM Gasoline Engine)

50/50 mixture of clean drinkable water and use only GM Goodwrench® DEX-COOL® or Havoline® DEX-COOL® coolant.

Engine Coolant (Caterpillar Diesel Engine)

See the Caterpillar ® Operation and Maintenance Manual for enigne coolant recommendations.

Engine Oil (Gasoline Engine)

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 (Caterpillar Diesel Engine)

See the Caterpillar ® Operation & Maintenance Manual for engine oil recommendations.

Exhaust Brake Ball Joint Cap Lubricant

High-Temperature Grease (GM Part No. 1051344 or equivalent) or NLGI #3 consistency.

Front Wheel Bearings with Oil Filled Hubs

SAE 75W-90 Synthetic Axle Lubricant for Medium Duty Trucks (GM Part No. 12345841 or equivalent).

Hydraulic Brake System

Delco Supreme 11® Brake Fluid (GM P/N 12377967 or equivalent DOT-3 brake fluid).

Manual Transmission

Synthetic Manual Transmission Fluid (GM Par No. 12345724) is the recommended lubricant to use.

Power Steering System

GM Power Steering Fluid (GM P/N 1052884 - 1 pint, 1050017 - 1 quart, or equivalent).

Propshafts and Splines

Wheel bearing lubricant meeting requirements of NLGI #2, Category GC or GC-LB (GM Part No. 1051344 or equivalent).

Rear Axle

SAE 75W-90 Synthetic Axle Lubricant for Medum Duty Trucks (GM P/N 12345841or equivalent).

Rear Axle Shift Motor Lubricant

Refrigerant Oil (GM Part No.l 5416939).

Spring Parking Brake Hydraulic Pump

DEXRON ®-III Automatic Transmission Fluid.

Wheel Bearing Grease

Wheel bearing lubricant meeting requirements of NLGI #2, Category GC or GC-LB (GM Part No. 1051344 or equivalent).

Windshield Washer Solvent

GM Optikleen ® Washer Solvent (GM Part No. 1051515) or equivalent.