Product Description
The Cummins 4089263 OEM Upper Engine Gasket Set is the correct factory gasket kit for 2003–2007 ISB 5.9L common-rail Cummins engines equipped with the rear gear train. This genuine Cummins set includes the essential upper-end sealing components required for cylinder head service, top-end rebuilds, injector service, and full upper-engine refresh procedures. Designed to withstand the heat, pressure, and thermal cycling of the 5.9L ISB platform, every gasket and seal in this kit meets exact OE specifications for durability and leak-free performance.
Whether replacing a head gasket, repairing coolant or oil leaks, or restoring a high-mileage common-rail Cummins, the 4089263 upper gasket set delivers OEM reliability far beyond aftermarket alternatives.
Fitment
- 2003–2007 Dodge Ram 2500 / 3500 with 5.9L ISB Cummins (Common Rail)
- Engines equipped with rear gear train (verify via engine serial number if unsure)
- Also used in select industrial ISB 5.9L rear-gear Cummins platforms (ESN verification recommended)
Cross-Reference (Cummins-Only)
Related Cummins components commonly serviced with upper engine gasket sets:
• Cummins 3900267 Tappet Cover Bolt Grommet Seal
• Cummins 3900625 Hex Flange Head Cap Screw
• Cummins 3903924 Timing Pin
FAQ
What is included in the Cummins 4089263 upper engine gasket set?
The set typically includes seals and gaskets for the head, valve cover, intake, exhaust, injector tube seals, and other critical upper-engine components. Exact contents may vary by ESN.
How do I know if my 5.9L Cummins uses a rear gear train?
Rear-gear 5.9L ISB engines position the gear housing at the rear of the block. The fastest way to confirm is by checking your engine serial number (ESN) or verifying your engine’s gear train location during service.
Does this kit include a head gasket?
Most Cummins full gasket sets include the head gasket, but upper-engine kits may vary by ESN. Always verify contents before ordering if a head gasket is required.
Is this gasket set compatible with both manual and automatic trucks?
Yes — transmission type does not affect upper-engine gasket fitment; verify engine configuration only.
Can this kit be used on 24-valve VP44 trucks?
No. This kit is specific to 2003–2007 ISB 5.9L common-rail rear-gear engines. VP44 engines use different gasket sets.
Specifications for cummins 4089263
| Specification | Value |
|---|---|
| Brand | Cummins Genuine Parts |
| Part Number | 4089263 |
| Component Type | Upper Engine Gasket Set – Rear Gear |
| UPC | Not Published |
| GTIN | Not Published |
| Cross Reference | Used across ISB 5.9L rear-gear engines (verify by ESN) |
| E-Codes | N/A |
| Shipping Weight | 2.0–3.0 lbs (varies by packaging) |
| Package Dimensions | 18 x 12 x 3 in |
| Prop 65 Warning | Not Applicable |
