Product Description
CUMMINS 3934048 OEM PISTON PIN (WRIST PIN) – RAM 5.9L (1994–2002) | B-SERIES 4BT/6BT
The genuine CUMMINS 3934048 OEM piston pin is the factory-specified wrist pin used in B-series 4BT and 6BT engines, including 1994–2002 Ram 5.9L 12-valve and 24-valve applications. Engine builders choose this pin because it delivers the exact hardness, weight, and dimensional accuracy required for proper piston-to-connecting-rod articulation. If you're rebuilding a high-mileage 5.9L, 4BT, or 6BT, replacing worn wrist pins is essential for long-term durability and quiet, stable piston operation.
Manufactured to OE metallurgy and heat-treatment standards, this pin ensures correct interference fit and flawless piston motion, eliminating the risk of premature wear, pin knock, or catastrophic piston failure. When rebuilding any B-series engine, always use genuine Cummins hardware for critical reciprocating components.
Key Features
- Genuine Cummins OEM wrist pin – exact fit and correct mass for B-series pistons.
- Precision-ground and hardened for long life in high-compression diesel applications.
- Compatible with 4BT, 6BT, 5.9L 12-valve, and 24-valve engines when matched with the correct OE piston.
- Reduces piston noise and wear caused by out-of-spec aftermarket pins.
- Ideal for complete engine rebuilds or single-cylinder service repairs.
Fitment Details
This OEM Cummins piston pin fits the following B-series applications (verify by ESN/VIN for accuracy):
- Engine Families: Cummins 4BT, 6BT, 5.9L 12-valve (’94–’98), 5.9L 24-valve (’98.5–’02)
- Vehicles: 1994–2002 Dodge Ram 2500/3500 5.9L Cummins
- Industrial / Agricultural: All compatible B-series 3.9L & 5.9L engines using OE piston design
Note: Always match piston pin diameter and length to the exact Cummins piston part number you are installing.
Cross-Reference & Related Cummins Components
CPP Diesel also stocks OEM Cummins piston and connecting rod hardware. Pair 3934048 with:
- CUMMINS 3920691 OEM PISTON RING SET – 5.9L
- CUMMINS 3942581 OEM PISTON ASSEMBLY – 5.9L
- CUMMINS 4891178 OEM CONNECTING ROD BUSHING
- VIEW ALL CUMMINS OEM PARTS
Cross-reference identifiers sometimes associated with 3934048 (verify by ESN): 3802750, 3921961, 3940742.
Installation Notes
- Always press wrist pins using proper rod heaters and fixtures to avoid distortion.
- Inspect piston bushings or connecting rod small ends for wear or scoring.
- Replace wrist-pin retainers, clips, and piston hardware during any rebuild.
Specifications for cummins 3934048
| Attribute | Value |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Cummins Part Number | 3934048 |
| Alternate / Cross Reference | 3802750, 3921961, 3940742 (verify by ESN) |
| Engine Compatibility | 4BT (3.9L), 6BT (5.9L), 5.9L 12-valve, 5.9L 24-valve |
| Vehicle Fitment | 1994–2002 Dodge Ram 2500/3500 with 5.9L Cummins |
| UPC / Barcode | 190861046518 |
| GTIN | 190861046518 |
| Shipping Weight | Approx. 0.35 lb |
| Shipping Method | Standard ground; expedited available at checkout |
| E-Codes / Emissions | Mechanical component; no emissions relevance |
| Prop 65 Warning | WARNING: May expose you to chemicals known to the State of California to cause cancer and reproductive harm. See www.P65Warnings.ca.gov. |
| Country of Origin | As labeled by Cummins (varies by batch) |
Frequently Asked Questions
IS THIS A GENUINE CUMMINS OEM WRIST PIN?
Yes. This is a 100% genuine Cummins 3934048 wrist pin, manufactured to OE specifications for B-series pistons.
WILL THIS FIT MY 1994–2002 RAM 5.9L?
Yes, when matched to the correct OE piston. Always verify by VIN/ESN to ensure compatibility with your piston part number.
CAN I USE AFTERMARKET PINS INSTEAD?
We strongly recommend OEM pins. Aftermarket pins often vary in hardness and mass, which can cause noise, accelerated wear, or piston failure.
SHOULD I REPLACE CONNECTING ROD BUSHINGS AT THE SAME TIME?
Yes. Anytime wrist pins show wear, inspect or replace the connecting rod bushing such as Cummins 4891178.
DO I NEED SPECIAL TOOLS TO INSTALL THIS?
Yes. Proper rod heaters and press fixtures are recommended to avoid rod distortion or piston damage.
