This factory service and repair manual for the 1990 GMC P60 is written for the P6T042, the year's only listed configuration, and the record carries no itemized engine displacement beside it. What the manual does carry is the factory's own repair method: procedures set out in working order, specifications to check against, torque values for putting things back, wiring diagrams for the chassis electrical systems, and diagnostic sequences for narrowing a fault down before anything is replaced.
Trims covered
- P6T042
Known issues on the 1990 P60. No recalls and no owner complaints appear on the federal record for the 1990 P60. With nothing documented against the model year, the manual is used as a straightforward workshop reference: the correct procedure for each job, the specifications and torque values that job requires, and the wiring diagrams and diagnostic routines needed to trace a circuit fault through a chassis that was finished by an outside body builder.
