Caterpillar D399, G399, D398, G398, D379, G379 ENGINES Factory Service & Shop Manual Price: $39.99 Complete workshop & service manual with electrical wiring diagrams for Caterpillar D399, G399, D398, G398, D379, G379 ENGINES. Read more about Caterpillar D399, G399, D398, G398, D379, G379 ENGINES Factory Service & Shop Manual