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GM Full-Size Trucks 1970-1979 Vacuum Diagrams Repair Guide

Access our free Vacuum Diagrams Repair Guide for GM Full-Size Trucks 1970-1979 through AutoZone Rewards. These diagrams include:

  • Fig. 1: Vacuum hose schematic – 1977 250 engine, light duty emissions
  • Fig. 2: Vacuum hose schematic – 1977 250 and 292 engines, heavy duty emissions (except California)
  • Fig. 3: Vacuum hose schematic – 1977 292 engine, heavy duty (California)
  • Fig. 4: Vacuum hose schematic – 1977 305 engine, light duty low altitude emissions
  • Fig. 5: Vacuum hose schematic – 1977 305 engine, heavy duty emissions
  • Fig. 6: Vacuum hose schematic – 1977 350 engine, light duty high altitude and California emissions
GM Full-Size Trucks 1970-1979 Vacuum Diagrams Repair Guide

Access our GM Full-Size Trucks 1970-1979 Vacuum Diagrams Repair Guide by creating an account or signing into your AutoZone Rewards account. Once you sign in, follow these instructions to access our Repair Guides.

  • Add your vehicle in My Vehicles.
  • Enter your vehicle details.
  • Click the “View More” button, and then click “Vehicle Repair Guides.”
  • Select “Chassis Electrical” in the Table of Contents.
  • Select the chapter “Vacuum Diagrams Repair Guide”.

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