This is a 1985 Chevrolet Medium Duty Truck Unit Repair Manual with the publication number ST-334-85A. It is a comprehensive guide for repairing and maintaining your Chevy or GMC truck from the year 1985. The manual was published by GM and is in paper format.

The manual contains detailed information on the various systems of the truck, including engine, transmission, brakes, suspension, and more. It also includes troubleshooting procedures and wiring diagrams. This manual is a valuable resource for any Chevy or GMC truck owner or mechanic looking to keep their vehicle running smoothly.