Interstate-McBee M-3910248 Bell Housing Adapter Plate Plug – 1989–2002 5.9L Cummins

Direct-fit bell housing adapter plate plug for 1989–2002 Dodge Ram 2500/3500 with 5.9L Cummins (12V & early 24V). Seals the access port on the passenger-side of the adapter plate to keep debris out and provide clean access to torque converter bolts (and barring-tool access for service). Built as an OEM-style aftermarket replacement for Cummins 3910248.

• Purpose-built seal: Closes the bellhousing adapter access hole to protect the flywheel/torque converter area.
• Service access: Allows quick access for torque converter bolt service and barring-tool operations.
• Direct replacement: Matches OEM form, fit, and function for a hassle-free install.
• Includes O-ring: Uses companion O-ring 3910260 for a positive seal (replace if worn).
• Aftermarket value: Interstate-McBee quality at a fraction of OEM cost.

Specifications

Vehicle Fitment

Always verify by engine serial number (ESN) for edge-case builds.

• Dodge Ram 2500/3500 – 5.9L Cummins
  • 1989–1993 12-Valve 6BT (D/W-Series)
  • 1994–1998 12-Valve 6BT (Ram)
  • 1998.5–2002 24-Valve ISB (early)
• Engine families: 4B/6B/ISB/QSB (varies by application)

Installation Tips

• Inspect/replace the O-ring (3910260) during installation; light oil on the O-ring helps seating.
• Clean the adapter plate bore; remove dirt and old seal material before installing the new plug.
• Push squarely into the bore until fully seated and flush.

What’s Included

• (1) Bell housing adapter plate plug
• O-ring sold separately (Cummins 3910260) unless otherwise stated

Why Buy From CPP Diesel

• Real diesel techs—fitment help by ESN
• Fast shipping & easy returns
• Huge Cummins B-series inventory to complete the job

FAQ