2021 Ram 4000 Service and Repair Manual

This factory service and repair manual for the 2021 Ram 4000 covers a heavy truck. It was sold only as a cab and chassis, in 2-door and 4-door versions. Power comes from one of two overhead-valve gasoline V8s without forced induction, a 5.7L (345 cu in) or a 6.4L (392 cu in). Three trims are listed, Crew, P and PL. Procedures, specifications, torque values and wiring diagrams address the engine, drivetrain, brakes and electrical system.

Engines covered

• 5.7L V8 (345 cu in) — OHV, naturally aspirated, gasoline
• 6.4L V8 (392 cu in) — OHV, naturally aspirated, gasoline

Body styles covered

• 4-door cab & chassis
• 2-door cab & chassis

Trims covered

• Crew
• P
• PL

Known issues on the 2021 4000. Consider the systems under load on a cab and chassis truck like this one. The 5.7L and 6.4L gasoline V8s rely on their fuel system, ignition and cooling system, and the manual gives procedures, specifications and diagnostics for both engines. Torque values and procedures reach the transmission, drivetrain, brakes, suspension and steering. On the electrical side, wiring diagrams follow the electrical system and body through the 2-door and 4-door cabs and the Crew, P and PL trims.