2-40-1221 – Stub & Midship Shaft – 16 X 1.375 Splines – Butt Dia 2.875″ – Tube Dia 3.000

2-40-1221 is a Stub & Midship Shaft that plays a crucial role in transmitting torque from the transmission to the differential. If you’re experiencing vibrations or noise during operation, this component is often the first suspect. The 16 X 1.375 splines ensure a secure connection, while the 3.000″ tube diameter and 0.065″ wall thickness contribute to its strength and durability.

When diagnosing driveline issues, pay attention to symptoms like vibrations that occur at specific speeds. If you notice a 2x-per-revolution vibration, it could indicate a problem with the stub shaft or its alignment. The 2.250″ spline length and 6.438″ end-to-weld measurement are critical for ensuring proper fitment and function. A mismatch here can lead to premature wear or failure.

• Verify that the spline count and diameter match your application.
• Ensure the tube diameter and wall thickness meet the necessary specifications for strength.
• Check the phasing marks during installation to avoid vibration issues.
• Torque all fasteners to the manufacturer’s specifications for optimal performance.
• Balance the assembly if any vibrations persist after installation.

Replacing a worn or damaged stub shaft with the 2-40-1221 restores proper function and enhances the longevity of your driveline system. This component is designed to handle the demands of various applications, making it a reliable choice for any technician looking to maintain or upgrade their vehicle’s performance.