This factory service and repair manual for the 1989 GMC P60 covers the P6T042 as the single listed configuration for the year, and the vehicle record itemizes no engine displacement to go with it. As a result the book reads as a systems manual, and it is organized that way: procedures for the work, specifications for the measurements, torque values for the fasteners, wiring diagrams for the circuits, and diagnostics for the faults that are easier to test for than to see.
Trims covered
- P6T042
Known issues on the 1989 P60. Federal records show neither recalls nor owner complaints for the 1989 P60. On a chassis-only commercial vehicle that record is thin by nature, and the manual is the more useful document in any case: it gives the procedures a repair follows, the specifications and torque values it depends on, and the wiring diagrams and diagnostic steps that make an electrical problem something you can measure.
