Product Description
Genuine Cummins
Cummins 3908032 — Engine Crankshaft Assembly With Gear (5.9L B-Series)
MPN: 3908032 | Also Known As: crankshaft w/ timing gear | Cross-Refs (for ID): 3907804, 3929037, 3903828, 3905730, 3863320
Why This Part
- ✓ OE crankshaft with gear installed for reliable timing interface.
- ✓ Direct-fit for B-Series 5.9L applications used in ’89–’02 Ram 2500/3500 (12V & 24V).
- ✓ Hardened journals and factory balance for smooth operation.
- ✓ Restores oil pressure stability and bottom-end durability after failure.
OE Fit With Gear 1 Per Engine
Quick Specs
| Type | Engine crankshaft assembly w/ timing gear |
|---|---|
| OE Part # | 3908032 |
| Cross-Refs (ID only) | 3907804, 3929037, 3903828, 3905730, 3863320 |
| Weight | ≈137–147 lb (shipping) |
| Qty Required | 1 per engine (sold individually) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1989–1998 | 5.9L 12V (VE ’89–’93 / P7100 ’94–’98) | Ram 2500/3500 |
| 1998.5–2002 | 5.9L 24V (VP44) | Ram 2500/3500 |
Industrial/Off-Highway: Used widely on 5.9L 6B/6BT/6BTA and select ISB/QSB engines; verify by ESN.
Often Paired With
- Main & rod bearing sets (size to your crank/bores)
- Thrust bearings · Rear main seal & front seal
- Harmonic balancer & crank bolt (replace if stretched)
- Crank gear alignment dowel pin: Cummins 3904483
- Oil pump & pickup (inspect/replace if debris present)
What’s In The Box
- (1) Genuine Cummins Crankshaft Assembly w/ Gear (3908032)
- Bearings, seals, hardware sold separately (see “Often Paired With”).
Install Tips
- Measure journals; confirm bearing sizes and clearances; check end-play.
- Use new bearings/seals; torque fasteners to spec; verify gear timing.
- Thoroughly flush oil system after any failure; prime before first start.
FAQ
WILL THIS FIT MY 1989–2002 5.9L CUMMINS RAM?Yes—3908032 is an OE B-Series 5.9L crankshaft assembly commonly used across ’89–’02 12V & 24V applications. Always confirm by VIN/ESN before ordering.
DOES THIS INCLUDE THE TIMING GEAR?Yes—this assembly ships with the crank gear installed (verify indexing during installation).
ARE BEARINGS INCLUDED?No—order main/rod/thrust bearings to match your required sizes.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3908032 crankshaft assembly.
WHAT ARE COMMON CROSS-REFERENCE NUMBERS?Common identifiers include 3907804, 3929037, 3903828, 3905730, and 3863320 (for identification only—order by ESN when possible).
