INTERSTATE-MCBEE M-3901221 SHORT ROCKER MOUNTING STUD 89-98 5.9L CUMMINS (AFTERMARKET REPLACEMENT)

Product Description

Interstate-McBee M-3901221 Short Rocker Mounting Stud – 1989–1998 5.9L Cummins 12-Valve

Short rocker mounting stud for the 5.9L Cummins 12-valve (6BT) valvetrain used in 1989–1998 Dodge Ram 2500/3500. Built to OE form, fit, and function for reliable rocker shaft service. Sold individually.

• Direct fit: Replaces the factory short rocker stud in the OE location.
• OE-equivalent quality: Interstate-McBee aftermarket replacement engineered for durability.
• Service friendly: Ideal for rocker shaft rebuilds and top-end refreshes.

What’s Included

• (1) Short rocker mounting stud, P/N M-3901221

Vehicle/Engine Fitment

Always verify by engine serial number (ESN) when possible.

• Dodge Ram 2500/3500 5.9L Cummins (12-valve 6BT)
  • Model Years: 1989–1998
• Other B-Series applications where Cummins 3901221 is specified (confirm by ESN).

Install Notes

• Clean threads and inspect rocker pedestals and shaft for wear before installation.
• Use proper torque per the Cummins service manual; apply thread lubricant or sealant only if specified.
• Service one assembly at a time to maintain rocker/bridge orientation.

Recommended/Related Parts

• Rocker shaft assembly and pedestals (12-valve)
• Rocker arm retaining nuts / hardware kit
• Push rods (12-valve)
• Valve cover gasket set

FAQ

Is this the short or long stud?

This listing is for the short rocker mounting stud (M-3901221). If you need the long stud, search by the long-stud part number or contact support with your ESN.

How many do I need?

Stud count can vary by assembly and service procedure. Verify quantity for your specific engine build in the Cummins manual or by ESN. Parts are sold individually.