CUMMINS 3958645 GENUINE OEM CYLINDER HEAD GASKET (THICK) FOR 2003–2007 DODGE RAM DIESEL

The Cummins 3958645 Cylinder Head Gasket (Thick) is a genuine OEM replacement designed for 2003–2007 Dodge Ram 2500/3500 trucks equipped with the 5.9L Cummins common rail engine. This thicker head gasket provides the proper compression ratio and durable sealing required for reliable engine performance.

Whether you are performing an engine rebuild, head swap, or repairing a blown gasket, the Cummins 3958645 ensures OEM fitment, heat resistance, and long-lasting durability. Trusted by diesel mechanics and performance builders alike, this gasket maintains factory-quality sealing to prevent coolant and oil leaks under heavy load conditions.

Features & Benefits

• OEM Cummins Quality: Direct replacement with guaranteed fit.
• Thick Design: Maintains proper compression ratio for rebuilds.
• Durability: Resistant to heat, pressure, and vibration.
• Exact Fitment: No modifications required, drop-in replacement.

Fitment

• 2003 Dodge Ram 2500/3500 5.9L Cummins
• 2004 Dodge Ram 2500/3500 5.9L Cummins
• 2004.5 Dodge Ram 2500/3500 5.9L Cummins (HPCR)
• 2005 Dodge Ram 2500/3500 5.9L Cummins
• 2006 Dodge Ram 2500/3500 5.9L Cummins
• 2007 Dodge Ram 2500/3500 5.9L Cummins

Cross Reference Part Numbers

• Cummins 3958645
• Replaces standard gasket applications when thicker option is required

Frequently Asked Questions

Why would I need a thick head gasket?

Thick head gaskets are used when machining or decking the cylinder head/block has reduced combustion chamber volume. They help restore the correct compression ratio.

Is this Cummins head gasket OEM?

Yes, this is a Genuine Cummins OEM head gasket (part #3958645), not an aftermarket reproduction.

Does this gasket fit both manual and automatic trucks?

Yes. The 3958645 head gasket fits all 2003–2007 Dodge Ram Cummins 5.9L engines regardless of transmission.

Related Categories

• 2003–2007 Cummins Gaskets & Seals
• All Cummins Gaskets & Seals
• Cylinder Heads & Components (03–07 Cummins)

Tags

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