CUMMINS 3955121 GENUINE ROCKER LEVER HOUSING FOR 2003–2005 5.9L CUMMINS

The Cummins 3955121 rocker lever housing is an OEM replacement designed for 2003–2005 Dodge Ram 5.9L Cummins common rail engines. This housing secures the rocker arms in place, maintaining precise alignment and stability under heavy load.

Worn or damaged rocker lever housings can cause valve lash issues, noise, and reduced valvetrain performance. Installing a genuine Cummins replacement restores durability and factory fit.

Features & Benefits

• OEM Precision: Ensures correct rocker arm alignment and operation.
• Durability: Built to withstand high cylinder pressures of Cummins diesel engines.
• Direct Replacement: Fits exactly like factory-installed housing.

Fitment

• 2003 Dodge Ram 2500/3500 5.9L Cummins
• 2004 Dodge Ram 2500/3500 5.9L Cummins
• 2005 Dodge Ram 2500/3500 5.9L Cummins

Cross Reference Part Numbers

• Cummins 3955121
• Replaces aftermarket equivalents: M-3955121

Frequently Asked Questions

When should I replace the rocker lever housing?

Replace it if you notice abnormal valvetrain noise, lash adjustment problems, or visible wear on the housing surface.

Can I reuse my old rocker arms with a new housing?

Yes, as long as the rocker arms are within spec and not excessively worn. Always inspect before reuse.

Do I need to torque the rocker lever housing bolts to spec?

Yes, always torque to OEM specifications to prevent warping or valvetrain misalignment.

Tags

cummins 3955121, cummins rocker lever housing, 5.9 cummins rocker housing, dodge ram rocker arm housing, cummins valvetrain parts, 2003 cummins rocker housing, 2004 cummins rocker housing, 2005 cummins rocker housing

Maintenance Note

Pro Tip: Whenever you replace a rocker lever housing, it’s recommended to reset valve lash clearances to Cummins factory specifications. Incorrect lash can lead to poor performance, valve damage, or premature wear.