This factory service and repair manual for the 1985 GMC P3500 handles four engines, two bodies and two trims. Gasoline buyers had the 7.4L V8, the 5.7L V8 or the 4.8L inline-six; the diesel option was the 6.2L V8. All are overhead-valve, naturally aspirated designs. The bodies were the two-door delivery van and the bare chassis, listed as Base Stripped and Value. Sections are cut by system, which keeps the specifications, torque values, wiring diagrams and diagnostic procedures for a given repair together instead of scattered by model.
Engines covered
- 7.4L V8 (454 cu in) — OHV, naturally aspirated, gasoline
- 6.2L V8 (379 cu in) — OHV, naturally aspirated, diesel
- 4.8L inline-six (292 cu in) — OHV, naturally aspirated, gasoline
- 5.7L V8 (350 cu in) — OHV, naturally aspirated, gasoline
Body styles covered
- 2-door van delivery van
- Chassis
Trims covered
- Base Stripped
- Value
Known issues on the 1985 P3500. Federal records for the 1985 P3500 show a clean sheet, with no recalls and no owner complaints. What the manual offers instead of a defect narrative is coverage: engine procedures and specifications for the 7.4L, 5.7L, 4.8L and 6.2L units, torque values for the assemblies involved, and wiring diagrams with diagnostic sequences for the chassis and body electrical circuits found on both versions of the truck.
CERTAIN HONEYWELL FRAM RACING BRAND HP4 AND HP8 OIL FILTERS THAT WERE MANUFACTURED FROM MAY 25, 2006, THROUGH SEPTEMBER 14, 2007, AND SOLD FOR USE AS REPLACEMENT EQUIPMENT FOR VEHICLES LIST ABOVE. TH
THIS CONDITION MAY CAUSE INADEQUATE SEALING AND LOSS OF ENGINE OIL, POSSIBLY RESULTING IN A FIRE.
HONEYWELL WILL REPLACE THE AFFECTED OIL FILTERS FREE OF CHARGE. THE RECALL BEGAN DURING NOVEMBER 20
