This factory service and repair manual for the 1991 GMC R2500 Suburban comes down to one trim, Base, on the four-door sport utility, with three naturally aspirated overhead-valve V8s available: 7.4 liters and 454 cubic inches, 6.2 liters of diesel at 379 cubic inches, and 5.7 liters at 350 cubic inches. A single trim makes the wiring diagrams straightforward to follow, and the rest of the book keeps the same shape, giving procedures, specifications, torque values and diagnostics system by system.
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 sport utility
Trims covered
- Base
Known issues on the 1991 R2500 Suburban. The federal record for the 1991 R2500 Suburban is clean: no recalls have been issued and no owner complaints have been logged with NHTSA. That puts the whole weight on reference material, and the manual delivers it across the vehicle — engine procedures and specifications for the 7.4L, the 6.2L diesel and the 5.7L, brake, suspension and steering figures for the chassis, driveline procedures, and wiring diagrams with the diagnostics needed to use them.
