Product Description
Genuine Cummins
Cummins 3910739 — Fan Hub Assembly Bearing (Ball Bearing)
MPN: 3910739 | Also Known As: fan hub bearing, ball bearing | Cross-Refs: 4429639, 180935
Why This Part
- ✓ OE bearing used in the engine-driven cooling fan hub.
- ✓ Direct-fit for Ram 5.9L & 6.7L applications (see Fitment).
- ✓ Restores smooth, quiet operation when the hub is noisy or seized.
- ✓ OE dimensions for proper press-fit and longevity.
OE Fit Stock Replacement 1 Per Hub
Quick Specs
| Type | Ball bearing for fan hub assembly |
|---|---|
| OE Part # | 3910739 (cross: 4429639, 180935) |
| Core Dimensions | ID 35 mm · OD 64 mm · Width 37 mm |
| Qty Required | 1 per fan hub (sold individually) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1989–1998 | 5.9L 12-Valve 6BT | Ram 2500/3500 |
| 1998.5–2002 | 5.9L 24-Valve ISB (VP44) | Ram 2500/3500 |
| 2003–2007 | 5.9L ISB (Common-Rail) | Ram 2500/3500 |
| 2007.5–2018 | 6.7L ISB (Common-Rail) | Ram 2500/3500 |
Industrial/Off-Highway: Also used on many 4BT/6BT/ISB fan hubs in equipment—verify by ESN.
Often Paired With
- Fan hub/bracket assembly (varies by year/engine)
- Fan clutch & fan blade (inspect for wobble/noise)
- Serpentine belt (replace if glazed or cracked)
- Fresh coolant if cooling work is performed
What’s In The Box
- (1) Genuine Cummins Fan Hub Bearing (3910739)
- Associated hub components sold separately.
Install Tips
- Press bearing squarely with correct tooling; do not load through the rolling elements.
- Confirm pulley alignment and belt tracking before startup.
- If the hub seized, inspect the clutch, fan, and belt for collateral damage.
FAQ
WILL THIS FIT MY 1989–2018 RAM 5.9L/6.7L?Yes—this OE bearing is listed for 1989–2018 Ram 2500/3500 with 5.9L or 6.7L Cummins (verify by VIN/ESN and hub style).
WHAT ARE THE BEARING DIMENSIONS?Approx. 35 mm inner diameter, 64 mm outer diameter, and 37 mm width (OE specification range).
WHAT ARE COMMON CROSS-REFERENCE NUMBERS?Common identifiers include 4429639 and 180935 in addition to 3910739.
WHAT SYMPTOMS INDICATE A FAILING FAN HUB BEARING?Rattling/squealing from the hub, wobble, or visible belt misalignment. Replace promptly to avoid fan/clutch damage.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3910739 ball bearing for the fan hub assembly.
Product Videos
Custom Field
Vehicle Year 1989-2012
Vehicle Make DODGE
ENGINE 5.9L / 6.7L CUMMINS
