Product Description
Interstate-McBee M-4089977 Piston Kit – .040" (1.00mm) Oversize for 03–04 5.9L Cummins 305HP
OEM-style .040" (1.00mm) oversize piston kit engineered for the 2003–2004 5.9L Cummins ISB (305HP). This direct-fit aftermarket kit includes the piston, hardened wrist pin, retainers, and ring set—ideal for overbore rebuilds requiring precise compression and durability.
- Application specific: For 2003–2004 5.9L Cummins 305HP engines.
- Oversize spec: .040" overbore (1.00mm) for properly machined cylinders.
- Complete single-cylinder kit: Includes piston, hardened pin, retainers, and rings.
- Direct-fit replacement: Aftermarket value with OEM-style performance.
Specifications
| Part Number | M-4089977 (Interstate-McBee) |
|---|---|
| OEM Cross-Ref | 4089977; additional cross-ref: 2243672WR040 |
| Engine | 5.9L Cummins ISB (inline-6) |
| Model Years | 2003–2004 (305HP configurations) |
| Bore Size | .040" oversize (1.00mm) |
| Included | Piston, hardened wrist pin, pin retainers, piston rings (sold individually) |
Vehicle Fitment
Verify by VIN/engine tag before ordering—see notes below.
- Dodge Ram 2500/3500 – 5.9L Cummins ISB (2003–2004, 305HP)
Important notes:
- 2003 model year: only High Output (HO) trucks are 305HP.
- Early 2004 model year: Federal emissions trucks are 305HP; California emissions trucks are not compatible with this piston.
- VIN check: 8th digit C = HO (305HP), 6 = SO. Engine tag power rating of 305HP confirms compatibility.
Install Tips
- Confirm machine shop overbore to 1.00mm (.040") and measure piston-to-wall clearance per Cummins specs.
- Check ring end gaps in the finished bore; orient ring gaps per service manual.
- These kits are sold individually (one cylinder). An inline-6 requires six kits for a full set.
Warranty
Interstate-McBee new engine components carry manufacturer warranty coverage. Contact us with your ESN for current terms applicable to piston kits.
Why Buy From CPP Diesel
- ESN/VIN-verified fitment support for 5.9L ISB nuances (HO vs SO; Federal vs California).
- Fast shipping, responsive support, and diesel-focused product curation.
- Trusted aftermarket brands like Interstate-McBee for reliable rebuilds.
FAQ
What engines does M-4089977 fit?2003–2004 Cummins 5.9L ISB 305HP applications only. See VIN and emissions notes above.
What’s included in the kit?
One piston, hardened wrist pin, retainers, and a matched ring set for a single cylinder.
Is this compatible with California-emissions 2004 trucks?
No. Early 2004 Federal 305HP trucks apply; California-emissions configurations are not compatible.
How do I confirm 305HP?
Check the engine tag for 305HP or verify the 8th VIN digit: C = HO (305HP), 6 = SO.
Product Videos
Custom Field
YEAR 2003-2004
MAKE DODGE
ENGINE 5.9L
