Cummins 5273413 — Genuine Camshaft Drive Gear for ISB 5.9L & 6.7L

MPN: 5273413  |  Also Known As: cam gear, camshaft drive gear  |  Cross-Refs (ID only): 3949358, 3965391, 5273732

Genuine Cummins camshaft drive gear that synchronizes the camshaft with the crankshaft for precise valve timing on ISB platforms. Direct-fit for 2003–2018 Ram 5.9L/6.7L common-rail applications. Built to OEM spec for tooth profile, hardness, and durability.

Features & Benefits

• OE tooth geometry & hardness for quiet operation and accurate timing.
• Direct-fit replacement for ISB 5.9L (CR) and 6.7L applications.
• Maintains valve-train accuracy to protect power, efficiency, and emissions.
• Precision-machined steel for long service life.
• Backed by Cummins for fit, function, and reliability.

Verified Fitment (Automotive)

Industrial/Off-Highway: ISB6.7/QSB6.7 (EPA13 era and others)—verify by ESN before ordering.

Specifications

• Type: Camshaft drive gear
• OE Part Number: 5273413
• Cross-References (identification): 3949358, 3965391, 5273732
• Material: Hardened steel (OE spec)
• Quantity: 1 per engine (sold individually)

Often Paired With

• Camshaft key: 3902332 (keys the gear to the cam)
• Camshaft thrust plate/retainer: 3944001
• Crankshaft drive gear: 5273412 (mates with cam gear)

What’s In The Box

• (1) Genuine Cummins Camshaft Gear (5273413)
• Keys/retainers sold separately (see “Often Paired With”).

Installation Tips

• Inspect the cam nose and keyway; replace the key if worn.
• Follow OEM torque and timing procedures; verify timing marks after install.
• Check thrust plate wear and end-play; replace if out of spec.

FAQ

WILL THIS CAM GEAR FIT MY 2003–2018 RAM 5.9L/6.7L?

Yes—this is the OE camshaft gear widely listed for 2003–2018 5.9L/6.7L Cummins Ram applications. For late years or engine swaps, confirm by VIN/ESN.

IS THIS A GENUINE CUMMINS PART?

Yes—OE Cummins part number 5273413.

WHAT OTHER PARTS SHOULD I REPLACE WITH THE GEAR?

Commonly replaced items include the camshaft key (3902332), the thrust plate/retainer (3944001), and inspecting the crankshaft gear (often 5273412) for wear.

DOES THIS WORK ON 12-VALVE OR VP44 (1994–2002) ENGINES?

It’s intended for common-rail platforms (2003+). Earlier engines may use different gear part numbers.

HOW DO I CONFIRM FITMENT?

Use your VIN/ESN to verify in Cummins QuickServe or contact us; industrial ISB/QSB usage can vary by calibration and build date.