SKU: JD05804
Trim level and powertrain change the numbers that matter: torque specs, wiring, fluid capacities, part numbers. A generic W6500 Forward guide gets you close. This is the documentation for your exact 1988 GMC W6500 Forward W6R042, not a nearby approximation.
The 1988 GMC W6500 Forward W6R042, 6.5L L6 (6BG1) DIESEL FI, has its own OEM-Authorized documentation set. Jayda pulls it from GMC's source: component locations, diagnostic procedures, wiring schematics, labor times, fluid specifications, OEM part numbers, torque specs, TSBs, and recall information specific to this configuration.
The right procedure for this W6500 Forward. Not a platform approximation.
All 12 OEM data features included with Pro Tech, grouped by how you'd actually use them.
