Interstate-McBee M-3946275 Exhaust Manifold Gasket – 98.5–07 5.9L Cummins

Direct-fit aftermarket replacement exhaust manifold gasket engineered by Interstate-McBee for 1998.5–2007 Dodge Ram 2500/3500 with 5.9L Cummins ISB. Built to OE specifications for reliable sealing and long service life. Sold individually—order 6 gaskets for a full engine set.

• OE-spec fit & performance: Matches Cummins 3946275 dimensions and sealing profile.
• High-quality materials: Designed to withstand heat cycles and vibration at the manifold flange.
• Aftermarket value: Trusted Interstate-McBee quality at a fraction of OEM cost.
• Fast install: Drop-in replacement when servicing manifolds, studs, or correcting leaks.

Specifications

Vehicle Fitment

Always verify by VIN/ESN for edge-case build dates.

• Dodge Ram 2500/3500 5.9L Cummins ISB
  • 1998.5–2002 (24-Valve)
  • 2003–2007 (24-Valve common-rail)

Install Notes

• Remove old gasket material completely; clean and inspect flange surfaces.
• Use new manifold hardware as needed; follow Cummins torque specs and sequence.
• Warm-up and recheck hardware torque after initial heat cycles if specified by your manual.

Warranty

Interstate-McBee new diesel engine parts are typically covered for 24 months from installation under normal use. Valve-train components may carry different terms. Contact us for exact coverage details.

Why Buy From CPP Diesel

• Real-world B-Series expertise and ESN-verified fitment support.
• Fast shipping and easy returns—built for working trucks.
• One-stop timing/exhaust service kits and hardware to finish the job right.

FAQ