Product Description
Interstate-McBee M-3969988 Intake Horn / Grid Heater Gasket – 1994–2007 5.9L Cummins
Restore a reliable seal between the intake horn (elbow), grid heater, and intake manifold on your 1994–2007 Dodge Ram 2500/3500 5.9L Cummins. The Interstate-McBee M-3969988 is an OEM-style, high-value replacement for Cummins 3969988 that helps prevent boost leaks, unmetered air, and dust intrusion after service work like injector swaps or manifold upgrades.
- Direct OEM cross-ref: Replaces Cummins 3969988 intake horn / grid heater gasket.
- Proven fitment: Designed for B-Series 5.9L Cummins (12V, 24V ISB, and 03–07 common-rail).
- Aftermarket value: Interstate-McBee quality at a better price than OEM.
- Service-friendly: Ideal to replace anytime the intake horn or grid heater is removed.
Specifications
| Interstate-McBee Part | M-3969988 |
|---|---|
| OEM Reference | Cummins 3969988 |
| Location | Connection between intake horn (elbow), grid heater, and intake manifold |
| Sold As | Each (quantity varies by engine generation; see notes below) |
Vehicle Fitment
Always verify by engine serial number (ESN) for exact compatibility.
- Dodge Ram 2500/3500 – 5.9L Cummins
- 1994–1998 12-Valve (1 gasket typically required)
- 1998.5–2002 24-Valve ISB (typically 2 gaskets required)
- 2003–2007 24-Valve common-rail (typically 2 gaskets required)
- Notes: Many 1989–1993 12-Valve applications also use 3969988. If working outside 1994–2007, confirm by ESN.
Installation Notes
- Remove old gasket material completely and clean mating surfaces.
- Install dry unless your Cummins service manual specifies sealant for your configuration.
- Follow factory torque specs and patterns for the grid heater/intake horn fasteners.
- On 24V/CR engines, expect two gaskets (horn-to-grid, grid-to-manifold).
Warranty
Interstate-McBee new engine parts generally carry 24-month coverage from date of installation. See manufacturer policy for details and exclusions (valve-train components may vary).
Why Buy From CPP Diesel
- ESN-verified fitment help from real diesel techs
- Fast shipping and easy returns
- Trusted brands including Interstate-McBee and OEM Cummins
FAQ
Is this the same as Cummins 3969988?Yes. Interstate-McBee M-3969988 is an OEM-style aftermarket replacement that cross-references directly to Cummins 3969988.
How many gaskets do I need?
Most 1994–1998 12-Valve setups use one gasket; 1998.5–2007 24-Valve and common-rail typically use two (horn-to-grid and grid-to-manifold). Always verify your layout.
Will this fit my 2003–2007 common-rail 5.9L?
Yes—common-rail 5.9L (2003–2007) uses the same 3969988 gasket; most require two pieces per service.
Do I need sealant?
Typically no; install dry unless the Cummins service manual for your ESN calls for a specific sealant.
Product Videos
Custom Field
YEAR 1994-2007
MAKE DODGE
ENGINE 5.9L
