2019 Mercedes-Benz Metris Transmission & Axle Gear Ratios

Transmission gear ratios

The 2019 Mercedes-Benz Metris is equipped with a 7G-TRONIC PLUS (722.9) seven-speed automatic transmission. This robust and efficient transmission is designed to optimize fuel economy and provide smooth power delivery across various driving conditions.

Available axle ratios

The Metris offers a selection of axle ratios to cater to different operational needs, balancing between towing capability and fuel efficiency.

How to identify your axle ratio

For Mercedes-Benz Metris owners, identifying your axle ratio is typically straightforward. You should look for the data plate or sticker that is generally located on the driver's side door jamb. This sticker will contain various production codes, including the RPO (Regular Production Option) codes for your vehicle's specific configuration. Look for codes like "A72" or "A73" which correspond to the axle ratios listed above. In some cases, a build sheet or a VIN decoder tool using your vehicle's VIN can also provide this information.

Towing vs MPG impact

Axle ratio plays a critical role in determining a vehicle's performance characteristics, specifically concerning towing capacity and fuel economy.

• Numerically Lower Ratio (e.g., 3.455): A numerically lower ratio means the engine will operate at lower RPMs at a given road speed. This generally translates to better fuel economy, as the engine isn't working as hard. However, it will reduce the vehicle's pulling power and acceleration, making it less ideal for heavy towing.
• Numerically Higher Ratio (e.g., 3.727): Conversely, a numerically higher ratio causes the engine to rev higher at the same road speed. This increases torque Multiplication at the wheels, providing greater towing capability and quicker acceleration. The trade-off is often a reduction in fuel efficiency due to the engine operating at higher RPMs.

For the 2019 Metris, the standard 3.455 ratio provides a good balance for most operations, while the optional 3.727 ratio is recommended for those who frequently tow heavier loads or operate the van with maximum payload, as it significantly enhances the pulling power.

Common issues

While the 7G-TRONIC PLUS transmission and Mercedes-Benz drivetrain components are generally reliable, some common issues can arise with high-mileage or neglected vehicles that may affect performance:

• Rear Axle Whine: A high-pitched whine from the rear of the vehicle, especially under acceleration or deceleration, can indicate wear in the ring and pinion gears or compromised carrier bearings. This is often a sign that differential fluid levels are low or that the fluid needs to be replaced.
• Limited-Slip Clutch Wear (if equipped): If your Metris is equipped with a limited-slip differential, wear on the clutch packs can lead to chattering or clunking noises during turns, or a noticeable decrease in traction on slippery surfaces. Regular differential fluid changes are crucial for the longevity of limited-slip units.
• Carrier Bearing Wear: The carrier bearings support the differential within the axle housing. Worn bearings can manifest as a humming or growling noise that changes with vehicle speed, often becoming more pronounced at highway speeds. Severe wear can lead to driveline vibrations.

Timely maintenance, including regular differential fluid checks and changes as per the Mercedes-Benz service schedule, can prevent many of these issues and extend the lifespan of your Metris's driveline components.

Find a driveline shop on Repairius.