Peterbilt 378 Service Manual | TruckManuals Peterbilt 378 Service Manual quantity. Add to cart. SKU: TMPB378SM Category: Peterbilt Manuals. Description; Reviews (0) Factory printed Peterbilt service manuals. This is the same manual as used by factory technicians. VIN number is needed when placing order. Place the VIN on the “Comments” line when placing your order. Peterbilt - Truck, Tractor & Forklift Manual PDF, DTC Supplemental Manuals_Peterbilt Medium Duty Trucks Owner's Manual. Supplemental Manuals_Peterbilt Medium Duty Trucks Owner's Manual. including for unusual markets: the universal model 378, visually different from the 379th sports hood made of aluminum, as well as the 330 model -y "with a unique luxury bedroom system.