2022 Mercedes-Benz Metris Transmission & Axle Gear Ratios

Transmission gear ratios

The 2022 Mercedes-Benz Metris is equipped with a 9G-TRONIC (9-speed automatic) transmission, known for its smooth shifts and efficiency. This transmission is paired with the M274 2.0L turbocharged 4-cylinder gasoline engine.

Available axle ratios

For the 2022 Mercedes-Benz Metris, Mercedes-Benz offers a limited selection of axle ratios, typically optimized for a balance of performance and fuel economy given its primary role as a commercial and passenger van. The most common axle ratio is 3.46. Mercedes-Benz usually doesn't offer a wide range of ratios for their vans, as their powertrain is designed to be efficient across various applications with a standard setup.

How to identify your axle ratio

Unlike domestic manufacturers like GM or Ford, Mercedes-Benz vehicles, including the Metris, don't typically have an easily accessible RPO (Regular Production Option) sticker on the door jamb that explicitly lists the axle code. Instead, you would generally need to refer to one of the following:

• VIN Decoder: Many online VIN decoders or a Mercedes-Benz dealership can provide a detailed build sheet for your specific VIN, which will include the axle ratio.
• Dealer Service Department: A Mercedes-Benz service department can look up your vehicle's specifications using your VIN.
• Data Plate: Older Mercedes-Benz vehicles often had a metal data plate under the hood or in the door jamb with various codes. While less common on newer models for axle ratios, it's worth a check. Look for a sticker or plate that provides transmission and differential codes.

Towing vs MPG impact

Axle ratios play a significant role in balancing a vehicle's towing capacity and fuel efficiency. This principle holds true for the Mercedes-Benz Metris:

• Numerically Lower Ratio (e.g., 3.46): A numerically lower axle ratio means the engine will operate at lower RPMs at a given road speed. This generally translates to better fuel economy, especially at highway speeds, as the engine doesn't have to work as hard. However, it can slightly reduce towing capability and acceleration, as less torque is multiplied at the wheels.
• Numerically Higher Ratio (e.g., 3.73 or 4.10, if available on other vehicles): A numerically higher axle ratio would result in the engine spinning at higher RPMs at a given road speed. This provides greater torque multiplication at the wheels, enhancing towing capacity and acceleration. The trade-off is typically reduced fuel economy, particularly during sustained highway driving.

For the Metris, with its standard 3.46 ratio, Mercedes-Benz aims for an optimal balance, providing sufficient towing capability for its class while maintaining respectable fuel efficiency for a commercial/passenger van.

Common issues

The 9G-TRONIC transmission in the Mercedes-Benz Metris is generally considered robust. However, like all mechanical components, issues can arise. Regarding the differential, specific common issues directly related to axle ratios for the Metris are not widely reported. General driveline issues, which can affect any vehicle, include:

• Differential Whine: A high-pitched whining noise that changes with vehicle speed can indicate wear in the ring and pinion gears or bearings within the differential.
• Carrier Bearing Wear: The carrier bearings support the differential carrier. Wear here can lead to humming or rumbling noises, especially when accelerating or decelerating.
• Limited-Slip Clutch Wear (if equipped): If your Metris had an optional limited-slip differential (less common in these vans), worn clutch packs could lead to chattering or clunking noises during turns.

Regular maintenance, including differential fluid changes as per the manufacturer's schedule, can help prevent many of these issues.

Find a driveline shop on Repairius.