2008 GMC C8500 Topkick Service and Repair Manual

This factory service and repair manual for the 2008 GMC C8500 Topkick covers one body configuration, the medium conventional straight truck, in three designations: C8C042, C8C064 and C8E042. Three engines were available in it, a turbocharged 7.2L inline-six diesel, a turbocharged 7.8L inline-six diesel and a naturally aspirated 8.1L OHV gasoline V8. With a single body to account for, the book can give more room to the powertrain, and each of the three engines has its own specifications and torque values.

Engines covered

• 7.2L inline-six (441 cu in) — turbocharged, diesel
• 7.8L inline-six (475 cu in) — turbocharged, diesel
• 8.1L V8 (496 cu in) — OHV, naturally aspirated, gasoline

Body styles covered

• Straight truck, medium conventional

Trims covered

• C8C042
• C8C064
• C8E042

Known issues on the 2008 C8500 Topkick. The manual is a maintenance and repair reference. It documents the turbocharged 7.2L and 7.8L inline-six diesels and the naturally aspirated 8.1L gasoline V8 with their own specifications, torque values and diagnostics, and provides wiring diagrams for the medium conventional straight truck in all three designations.