October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.
GMC: 1990: Forward Control 4.3 Z, Automatic, 3L80-HD/M40
This is a LEMON manual, retrieved in 2025.
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 4.3 Z, Automatic, 3L80/M40
- Forward Control 5.7 K, Automatic, 3L80-HD/M40
- Forward Control 5.7 K, Automatic, 3L80/M40
Repair and Diagnosis
Repair and Diagnosis, all links on one page (may load slowly, but easier to search)
Download .zip for offline use