CUMMINS 3908032 OEM ENGINE CRANKSHAFT WITH GEAR – RAM 5.9L 12V/24V (1989–2002)

Product Description

The Cummins 3908032 OEM Engine Crankshaft With Gear is a complete, genuine Cummins crankshaft assembly designed for 1989–2002 Dodge Ram 2500/3500 5.9L 12V & 24V applications as well as many 6B/6BT/6BTA and ISB/QSB industrial engines. This factory-balanced crank comes with the timing gear already installed, giving you OE-quality bottom-end durability, precise timing drive, and drop-in compatibility when rebuilding or replacing a failed 5.9L B-Series crankshaft.

Built from high-strength forged steel and finished to tight OEM journal tolerances, the 3908032 crankshaft is the right choice when you need maximum reliability in towing, work, or performance builds. Pair it with new OEM bearings, seals, and dowel hardware to restore oil pressure stability, reduce vibration, and protect your investment for the long haul.

Fitment – Ram & B-Series 5.9L

• 1989–1998 Dodge Ram 2500/3500 with 5.9L 12-Valve Cummins (VE and P7100 trucks)
• 1998.5–2002 Dodge Ram 2500/3500 with 5.9L 24-Valve Cummins (VP44)
• Many Cummins 6B / 6BT / 6BTA and select ISB/QSB 5.9L engines – verify by ESN

Note: Some late 24V applications with crankshaft position sensor / tone-ring requirements may use a different crank. Always confirm by VIN/ESN and build data before ordering.

Key Features

• Genuine Cummins 3908032 crankshaft assembly with timing gear installed
• Engineered for 5.9L B-Series bottom-end reliability in severe-duty use
• Factory-balanced for smooth operation and reduced vibration
• Standard journal sizing – match bearings to measured clearances
• Direct-fit for most 1989–2002 Ram 5.9L 12V/24V builds when ordered by ESN

Cross-Reference (ID Only)

Common identification numbers associated with this crankshaft include:

• 3907804
• 3929037
• 3903828
• 3905730
• 3863320

These are provided for identification only. Always confirm with the engine serial number (ESN) and Cummins documentation before ordering.

Recommended Cummins Companion Parts (CPP Diesel)

Complete your bottom-end and front cover service with these genuine Cummins parts from CPP Diesel:

• CUMMINS 3929027 OEM CRANKSHAFT GEAR – RAM 5.9L (1989–2002)
• CUMMINS 3904483 OEM CRANKSHAFT GEAR ALIGNMENT DOWEL PIN – 5.9L (1989–2002)
• CUMMINS 3937111 OEM FRONT CRANKSHAFT SEAL SERVICE KIT – 5.9L CUMMINS (1989–2007)
• CUMMINS 3802820 OEM FRONT CRANKSHAFT SEAL WITH WEAR SLEEVE – RAM 5.9L/6.7L (1989–2018)
• CUMMINS 5259499 OEM REAR MAIN CRANKSHAFT SEAL – RAM 5.9L/6.7L (1989–2018)

What’s Included

• (1) Genuine Cummins 3908032 crankshaft assembly with timing gear installed
• Bearings, seals, dowels, and hardware sold separately

Installation Notes

• Measure all main and rod journals; choose bearing sizes based on actual clearances.
• Verify crank end-play and thrust bearing alignment.
• Confirm correct timing gear indexing and dowel engagement.
• Thoroughly clean oil passages and prime the lubrication system before first start.

FAQ

Will this Cummins 3908032 crankshaft fit my 1989–2002 Ram 5.9L?

In most cases, yes. The 3908032 crankshaft is widely used across 1989–2002 5.9L B-Series 12V and 24V applications. However, you should always confirm by VIN/ESN and your Cummins build data, especially on late 24V engines with crank sensor requirements.

Does this crankshaft include the timing gear?

Yes. This is a complete crankshaft assembly with the timing gear installed, so you don’t have to swap gears from the old crank (verify timing alignment during installation).

Are main and rod bearings included with the 3908032 assembly?

No. Bearings are sold separately. We recommend ordering new OEM main, rod, and thrust bearings sized to your measured journal and housing dimensions for the best longevity.

Can I use this crankshaft in performance or towing builds?

Yes. Genuine Cummins crankshafts are an excellent foundation for performance or heavy towing builds when paired with proper balancing, quality bearings, and a good damper.

What other Cummins parts should I replace when installing a new crankshaft?

At minimum, we recommend a front crank seal kit, rear main seal, crankshaft gear alignment dowel, and fresh oil pump. See the Cummins cross-referenced parts listed above for options available directly from CPP Diesel.

Specifications for cummins 3908032