2008 GMC T7500 Service and Repair Manual

This factory service and repair manual for the 2008 GMC T7500 has one engine on its list, the turbocharged 7.8L inline-six diesel of 475 cubic inches, fitted to the T7F042 configuration. Late in the model's run the truck was a settled design, and the book reads that way: procedures for engine service, cooling, fuel delivery, driveline and brakes stated once and stated plainly, with the published specifications and torque values alongside them and wiring diagrams and diagnostic sequences covering the chassis circuits that support the whole.

Engines covered

• 7.8L inline-six (475 cu in) — turbocharged, diesel

Trims covered

• T7F042

Known issues on the 2008 T7500. For a truck bought to work, the questions are the ordinary ones: what the clearance should be, what the fastener torques to, why a circuit reads the way it does. The manual answers those with published specifications and torque values for the 7.8L diesel and chassis, and with wiring diagrams tied to diagnostic sequences.