2020 Mercedes-Benz Sprinter Transmission & Axle Gear Ratios

Transmission gear ratios

The 2020 Mercedes-Benz Sprinter is offered with two primary transmission options, depending on the engine and driveline configuration: a 7-speed automatic (7G-TRONIC) and a 9-speed automatic (9G-TRONIC).

7G-TRONIC (NAG2) 7-Speed Automatic Transmission

This transmission was commonly paired with the 3.0L V6 BlueTEC diesel engine in previous generations and some 2020 models, particularly in the 2500 and 3500 series. It is known for its smooth shifts and robust design.

9G-TRONIC (NAG3) 9-Speed Automatic Transmission

Introduced to the Sprinter lineup, especially with the 2.0L 4-cylinder gasoline and 2.0L 4-cylinder diesel engines, this transmission offers a wider gear spread for improved fuel economy and performance.

Available axle ratios

Mercedes-Benz offers a range of axle ratios for the 2020 Sprinter, allowing buyers to optimize their vehicle for specific needs, whether it's heavy towing, better fuel economy, or a balanced approach.

Note: Specific RPO codes can vary by region and model year. Always verify with your vehicle's documentation.

How to identify your axle ratio

Unlike domestic manufacturers that often place RPO codes on a door-jamb sticker, Mercedes-Benz Sprinters typically require a different approach to identify the axle ratio. Your best bet is to check the vehicle data card, which can often be obtained from a Mercedes-Benz dealer using your VIN. Some international markets might have a data plate under the hood or on the axle itself. For the most accurate information, contacting a Mercedes-Benz service center with your VIN is recommended.

Towing vs MPG impact

The choice of axle ratio significantly impacts a vehicle's performance characteristics. This is a fundamental principle of powertrain engineering:

• Numerically Lower Ratios (e.g., 3.69): These ratios mean the driveshaft spins fewer times for every rotation of the wheel. This results in lower engine RPMs at cruising speeds, leading to better fuel economy and quieter highway driving. However, it also means less torque multiplication at the wheels, which can reduce towing capacity and acceleration, particularly when heavily loaded.

• Numerically Higher Ratios (e.g., 4.18): These ratios mean the driveshaft spins more times for every rotation of the wheel. This translates to higher engine RPMs at any given road speed, providing improved towing capability and quicker acceleration. The increased torque multiplication allows the vehicle to move heavier loads with less strain on the engine. The trade-off is often reduced fuel economy due to the engine working at higher RPMs.

For Sprinter owners, selecting the appropriate axle ratio is crucial. If your primary use involves frequent heavy hauling, towing, or navigating steep grades, a higher (numerically larger) axle ratio will offer superior performance. If your Sprinter is primarily used for lighter loads, long-distance highway travel, or maximizing fuel efficiency, a lower (numerically smaller) axle ratio would be more beneficial.

Common issues

While the Mercedes-Benz Sprinter driveline components are generally robust, like any mechanical system, they can experience wear over time. Specific to axle ratios and differentials, some issues include:

• Ring & Pinion Whine: A common symptom of worn or improperly set up differential gears. This typically manifests as a howling or whining noise that changes with vehicle speed and whether the vehicle is accelerating, decelerating, or coasting. Pinion bearing wear can also contribute to this.

• Carrier Bearing Wear: The carrier bearings support the differential carrier within the axle housing. Wear in these bearings can lead to noise, vibrations, and eventually differential failure if not addressed.

• Limited-Slip Differential (LSD) Clutch Wear: If equipped with an LSD, the internal clutches can wear out over time, leading to a loss of the limited-slip function. Symptoms might include a clunking noise from the rear end, especially when turning at low speeds, or a noticeable decrease in traction on slippery surfaces where the LSD would normally engage.

Regular maintenance, including differential fluid changes at recommended intervals, is key to prolonging the life of your Sprinter's driveline components.

Find a driveline shop on Repairius.