Product Description
Interstate-McBee M-3957492 Rear Seal Housing Gasket – 2003–2018 5.9L / 6.7L Cummins
Replacement rear crankshaft seal housing gasket for the 2003–2018 Dodge Ram with 5.9L or 6.7L Cummins. Restores a proper seal between the rear main seal carrier and the engine block to help prevent oil seepage. Sold individually.
- Direct replacement: Matches OE geometry for a reliable seal at the rear cover/housing.
- Durable materials: Manufactured to OE-equivalent specs for heat and oil resistance.
- Service friendly: Ideal when replacing the rear main seal or resealing the housing.
- Interstate-McBee quality: Trusted aftermarket alternative to OEM packaging.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3957492 |
| OEM Reference | Cummins 3957492 (rear seal housing gasket) |
| Sold As | Each (1 gasket) |
| Position | Rear crankshaft seal housing to block |
What’s Included
- (1) Rear seal housing gasket, P/N M-3957492
Vehicle Fitment
Always verify by engine serial number (ESN) when possible.
- Dodge Ram 2500/3500 5.9L Cummins (2003–2007)
- Dodge/Ram 2500/3500/4500/5500 6.7L Cummins (2007.5–2018)
- Other B-Series applications where Cummins 3957492 is specified (confirm by ESN)
Recommended/Related Parts
- Rear main seal (crankshaft rear oil seal), 5.9L/6.7L
- Rear seal housing (carrier) bolts
- Engine oil pan gasket / RTV (if removed during service)
Install Notes
- Clean block and housing surfaces thoroughly; remove old gasket material and residue.
- Dry-fit the housing and check alignment dowels. Install gasket without stretching or kinking.
- Follow the Cummins service manual for torque specs and tightening sequence on housing bolts.
- If replacing the rear main seal, use the correct installer tool and depth; avoid seal lip damage.
Why Buy From CPP Diesel
- ESN-verified fitment assistance from diesel specialists
- Fast shipping and easy returns
- Large inventory of Cummins B-Series sealing components
FAQ
Is this the gasket behind the rear main seal?
This is the housing gasket that seals the rear main seal carrier to the engine block. The rubber rear main seal itself is sold separately.
How many do I need?
One gasket per engine. This part is sold individually.
Do I need RTV with this gasket?
Use RTV only where specified by the service manual (typically at case splits/corners). Do not over-apply.
