1989 GMC R3500 Service and Repair Manual

This factory service and repair manual for the 1989 GMC R3500 lists three engines — a 7.4L gasoline V8 of 454 cubic inches, a 6.2L diesel V8 of 379 cubic inches and a 5.7L gasoline V8 of 350 cubic inches, all naturally aspirated and overhead-valve — across four bodies and the Base, High Sierra and Sierra Classic trims. Those bodies run from crew cab and standard cab pickups to two- and four-door cab and chassis units, and the systems common to all of them are documented with procedures, specifications, torque values, wiring diagrams and diagnostics.

Engines covered

• 7.4L V8 (454 cu in) — OHV, naturally aspirated, gasoline
• 6.2L V8 (379 cu in) — OHV, naturally aspirated, diesel
• 5.7L V8 (350 cu in) — OHV, naturally aspirated, gasoline

Body styles covered

• 4-door crew cab pickup
• 2-door standard cab pickup
• 4-door cab & chassis
• 2-door cab & chassis

Trims covered

• Base
• High Sierra
• Sierra Classic

Known issues on the 1989 R3500. What a shop needs from a book like this is the original data, and it is here: cylinder head and bearing specifications for the three V8s, brake dimensions, wheel bearing adjustment and axle procedures for a chassis built to carry weight, and torque values throughout. Wiring diagrams and diagnostics cover the cab and chassis circuits, including the connections a body builder would have worked from.