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

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