Product Description
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
| Brand | Interstate-McBee |
|---|---|
| Part Number | M-3946275 |
| OEM Cross-Reference | Cummins 3946275 |
| Position | Exhaust manifold to cylinder head |
| Quantity | Sold individually (6 required per 5.9L engine) |
| Compatibility | 5.9L Cummins ISB (see fitment below) |
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
Is this sold as a single gasket or as a set?It’s sold individually. You’ll need six gaskets to service all ports on a 5.9L Cummins.
Will it fit both 1998.5–2002 and 2003–2007 5.9L models?
Yes—listed for all 1998.5–2007 Dodge Ram 2500/3500 with 5.9L Cummins ISB.
Does this include manifold studs or hardware?
No—gasket only. We recommend new studs/bolts and checking the manifold for warpage.
What torque specs should I use?
Always follow the Cummins service manual for torque values and tightening sequence for your model year.
Product Videos
Custom Field
YEAR 1998.5-2007
MAKE DODGE
ENGINE 5.9L
