CUMMINS 3970305 GENUINE TIMING GEAR HOUSING - OEM FOR 2003-2007 5.9L CUMMINS

The Cummins 3970305 Genuine Timing Gear Housing is an OEM replacement front cover housing for 2003-2007 Dodge Ram 5.9L Cummins common rail diesel engines. This housing encloses the camshaft and crankshaft gears, protecting the timing components while providing a proper sealing surface for the front gasket set.

Ideal for engine rebuilds or repairs where the original timing gear housing has been cracked, worn, or damaged. Built to Cummins specifications for long-term reliability and sealing integrity.

Features & Benefits

• OEM Fit & Finish: Direct replacement housing engineered by Cummins.
• Sealing Surface: Works with Cummins gaskets to prevent oil and coolant leaks.
• Protects Timing Gears: Shields the camshaft and crankshaft gears from debris and damage.

Cross Reference Part Numbers

• Cummins 3970305
• Replaces: 3970303, 3970304
• Interstate McBee M-3970305

Frequently Asked Questions

When should I replace the timing gear housing?

Whenever the housing is cracked, warped, or leaking around the gasket surface. Replacement is also recommended during major rebuilds.

Does this include gaskets?

No, gaskets are sold separately. We recommend using a Cummins gasket set for proper sealing.

Is this housing compatible with aftermarket timing gears?

Yes, as long as the gears are machined to OEM Cummins specifications.

Related Timing & Valvetrain Components

• Cummins 5273412 Crankshaft Drive Gear - Works with camshaft gear for timing synchronization.
• Cummins 5273413 Camshaft Drive Gear - Installs inside this housing for proper cam timing.
• Cummins Engine Gasket Sets - Includes front cover gaskets for housing installation.
• Cummins Valvetrain Components - Valves, tappets, and springs for complete rebuilds.