Product Description
Interstate-McBee M-3957492 Rear Main Seal Housing Gasket – 03–18 5.9L/6.7L Cummins
Precision rear main seal housing (rear cover) gasket engineered as an OEM-style aftermarket replacement for 2003–2018 5.9L & 6.7L Cummins (Dodge Ram 2500/3500). Replace this gasket any time the rear seal housing is removed to ensure a reliable, leak-free seal.
- Direct-fit design: Matches Cummins OE form, fit, and function for fast, trouble-free service.
- Reliable sealing: Maintains proper crankcase sealing at the rear cover/housing.
- Aftermarket value: Interstate-McBee quality at a cost lower than OEM boxed parts.
- Service best practice: Replace during rear main seal or rear cover work to prevent repeat leaks.
Specifications
| Manufacturer | Interstate-McBee |
|---|---|
| Part Number | M-3957492 |
| OE Cross-References | Cummins 3957492 (rear cover gasket); supersession commonly noted to 5443388 on later applications |
| Position | Rear main seal housing / rear cover (a.k.a. rear gear cover) |
| What’s Included | (1) Rear seal housing gasket |
Vehicle Fitment
Always verify by engine serial number (ESN) when possible.
- Dodge Ram 2500/3500 with Cummins B-Series:
- 5.9L ISB (24-Valve): 2003–2007
- 6.7L Cummins: 2007.5–2018
Install Notes
- Clean mating surfaces thoroughly; remove all old gasket material and residue.
- Follow the Cummins service manual for housing alignment and torque sequence/specs.
- Replace gasket whenever the rear cover/housing is removed (e.g., rear main seal service).
- Use RTV only where specified by the service manual (typically at case joints/corners).
Warranty
Covered under Interstate-McBee parts warranty policy. For exact terms and claim procedure, contact us.
Why Buy From CPP Diesel
- ESN-verified fitment assistance from real diesel techs
- Fast shipping and easy returns
- Deep catalog coverage for B-Series service parts
FAQ
Does this fit both 5.9L and 6.7L Cummins?Yes. It covers 2003–2007 5.9L ISB and 2007.5–2018 6.7L Dodge Ram applications. Verify by engine serial number for special cases and late-year transitions.
What is the difference between Cummins 3957492 and 5443388?
3957492 is the commonly referenced OE gasket number for 2003–2018. Some catalogs show a later supersession to 5443388 on newer engines. If your VIN/ESN calls for 5443388, order that number.
Should I replace this gasket when doing a rear main seal?
Yes. Any time the rear main seal housing/cover is removed, install a new gasket to ensure proper sealing and avoid repeat leaks.
Is this an OEM Cummins part?
This is an Interstate-McBee aftermarket gasket built to OEM-equivalent specs. If you require an OEM boxed part, the Cummins numbers referenced above apply.
Product Videos
Custom Field
YEAR 2003-2018
MAKE DODGE
ENGINE 5.9L,6.7L
