GMC: 1991: Forward Control 3.9 L, NV4500/MT8

This is a LEMON manual, retrieved in 2025.

• Repair and Diagnosis
• Repair and Diagnosis, all links on one page (may load slowly, but easier to search)
• Download .zip for offline use

This manual is identical to the manual for the following model variants, except for possibly the "Labor Times", "Fluids", and "Tire Fitment" pages:

• Forward Control 3.9 L, SM465/M20
• Forward Control 4.3 Z, Standard, NV4500/MT8
• Forward Control 4.3 Z, Standard, SM465/M20
• Forward Control 5.7 K, Standard, NV4500/MT8
• Forward Control 5.7 K, Standard, SM465/M20