CUMMINS 3929027 OEM CRANKSHAFT GEAR – RAM 5.9L (1989–2002)

Product Description

The Cummins 3929027 OEM Crankshaft Gear is the factory timing gear used on 1989–2002 Dodge Ram 2500/3500 trucks equipped with the 5.9L Cummins (12-valve & 24-valve ISB). This hardened steel gear is essential for precise camshaft and injection pump timing, ensuring smooth engine operation, long-term reliability, and correct synchronization of all rotating components. Using a genuine Cummins crank gear prevents timing drift, excessive wear, and gear train noise commonly seen with aftermarket alternatives.

Whether performing a full engine rebuild, repairing timing gear wear, or replacing a damaged crankshaft assembly, the 3929027 crankshaft gear maintains OE timing accuracy and service life.

Fitment

• 1989–1998 Dodge Ram 2500/3500 with 5.9L 12-Valve Cummins (6BT)
• 1998.5–2002 Dodge Ram 2500/3500 with 5.9L 24-Valve ISB Cummins
• 5.9L B-Series industrial/off-highway engines using OEM crankshaft timing gear

Note: Fitment for industrial or equipment engines should be confirmed by engine serial number (ESN).

Cross-Reference (Cummins-Only)

Related crankshaft & timing components:
• Cummins 3903924 OEM Timing Pin – 12-Valve
• Cummins 3904408 OEM Valve Stem Guide – 60.50mm
• Cummins 3904409 OEM Valve Stem Guide – 51.75mm

FAQ

Does this gear fit both 12-valve and 24-valve 5.9L engines?

Yes. The 3929027 crank gear fits all 1989–2002 5.9L Cummins engines in Dodge Ram trucks.

Should the crank gear be replaced during an engine rebuild?

Yes. Cummins recommends replacing worn timing gears to prevent backlash, timing noise, or pump timing inaccuracies.

Is this gear press-fit onto the crankshaft?

Yes. The crankshaft gear is heated and installed as an interference fit. Proper tools and procedure are required.

Can I reuse my old crank gear?

Reusing is not recommended if the gear shows wear, pitting, tooth rounding, or looseness. Timing issues can result.

Specifications for cummins 3929027