Mercedes W221 Propshaft OM642 CDI Drive Prop Shaft Automatic A2214100816

Mercedes W221 S320/350 CDI Driveshaft OM642 Automatic is a drivetrain component designed for S-Class sedans equipped with the OM642 engine and an Automatic transmission. It is responsible for the stable transfer of torque between the gearbox and the rear drivetrain, which directly impacts the smoothness and comfort of the ride. A used driveshaft from this series offers a technically sound repair solution without the need to invest in a new component.

Specifications and technical data

• SKU: A2214100816
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2214100816
• Substitutable numbers: A2214100816, A 221 410 08 16
• Gearbox type: Automatic
• Category: Propshafts

Application and Compatibility

The presented driveshaft is intended for Mercedes S-Class W221 models in the S320 CDI and S350 CDI versions with the OM642 engine and an automatic transmission. Its construction is tailored to the chassis geometry of this platform, ensuring correct operating angles and compatibility with factory suspension components and mounting points.

This part belongs to the Cardan Joints group, meaning it compensates for changes in the drive axle's position relative to the gearbox during suspension operation. Proper selection of the driveshaft for a specific body style and drivetrain configuration minimizes the risk of vibrations, noise, and accelerated wear of other drivetrain components.

Construction and Technical Characteristics

The driveshaft in this configuration utilizes Cardan-type universal joints and support bearings, enabling smooth operation at variable rotational speeds and loads typical for a heavy F-segment sedan. The design is optimized for automatic transmissions, providing adequate torsional stiffness and vibration damping.

Being an original part from the Mercedes brand, key geometric parameters such as working length, flange connection spacing and type, and universal joint operating characteristics are preserved. This translates to proper balancing of the entire system and reduction of phenomena like resonance at specific driving speeds.

Benefits of Using a Used Driveshaft

Choosing a used driveshaft for the W221 S320/350 CDI is particularly advantageous in case of failures manifesting as body vibrations, clunks on acceleration, or jerking under load changes. Using an original part from the same model series allows for:

• maintaining factory fitment with the drivetrain and suspension,
• reducing repair costs while preserving correct operating parameters,
• minimizing the risk of issues arising from imprecise aftermarket replacements.

A used part from the Cardan Joints category is a good solution when the priority is to restore vehicle functionality while maintaining compliance with the original drivetrain design.

Selection, Installation, and Operational Aspects

Before installation, it is recommended to verify compatibility with the specific vehicle equipment version, particularly regarding the transmission type and drivetrain configuration. The driveshaft should be installed while observing factory alignment marks and bolt tightening procedures to maintain proper balance and alignment.

After installation, pay attention to:

• the absence of unusual vibrations at urban and highway speeds,
• smooth torque transfer during acceleration and engine braking,
• proper interaction with suspension components and driveshaft supports.

A correctly selected and installed driveshaft supports the stable operation of the automatic transmission and the driving comfort characteristic of the S-Class.

If you are planning a comprehensive repair or upgrade of the drivetrain area in your Mercedes and need other parts from the same group, such as intermediate shafts, flexible couplings, or driveshaft supports, check the available parts in the Mercedes Cardan Joints category.

If you are considering a broader range of work on the running gear and want to better understand the relationships between drivetrain and suspension components, the guide article Stock vs. Sport Suspension – Construction Differences and Selection of Used Parts may be helpful, facilitating informed choices of used components in premium vehicles.