2019 Mercedes-Benz Sprinter Transmission & Axle Gear Ratios

Transmission gear ratios

The 2019 Mercedes-Benz Sprinter offers two primary transmission options: a 7-speed automatic (7G-TRONIC) and a 9-speed automatic (9G-TRONIC). The 9G-TRONIC was introduced later in the production run for some engine configurations, offering improved fuel economy and smoother shifts.

7G-TRONIC (NAG2) Automatic Transmission

9G-TRONIC (NAG3) Automatic Transmission

Available axle ratios

The 2019 Sprinter was available with several axle ratios, designed to optimize for various uses, from maximizing fuel economy to heavy-duty towing.

How to identify your axle ratio

Identifying your Sprinter's axle ratio can be crucial for maintenance, repair, or upgrade purposes. Unlike some domestic manufacturers, Mercedes-Benz Sprinters don't typically have an easily accessible RPO sticker on the door jamb that explicitly lists the rear axle code in a simple format. Instead, you'll likely need to consult the vehicle's data card, which can be accessed through a Mercedes-Benz dealership or by using a VIN decoder that provides detailed build information. The axle ratio is usually listed as part of the transmission and axle codes on this data card.

Alternatively, for some older or even newer models, a metal tag on the differential housing itself might be present, though this is less common on modern Sprinters. The tag would typically show the ratio stamped directly on it (e.g., "3.923").

Towing vs MPG impact

The axle ratio plays a significant role in determining the balance between towing capability and fuel economy. A numerically lower axle ratio (e.g., 3.923) means the engine will run at lower RPMs at a given road speed. This generally translates to better fuel economy, especially during highway cruising, but it reduces the vehicle's pulling power and acceleration. This setup is ideal for drivers who primarily carry light loads, travel long distances, and prioritize fuel efficiency.

Conversely, a numerically higher axle ratio (e.g., 4.727) causes the engine to rev higher at the same road speed. This provides increased torque multiplication to the wheels, resulting in superior towing and hauling capabilities, quicker acceleration, and better performance on inclines. However, the trade-off is reduced fuel economy, particularly at higher speeds, and potentially more engine noise. This ratio is best suited for fleet operators or individuals who frequently tow heavy trailers or transport heavy cargo.

Common issues

While the Sprinter's drivetrain components are generally robust, some common issues can arise over time related to the transmission and axle:

• Ring and Pinion Whine: A persistent howling or whining noise that changes with road speed, especially between certain speeds or during deceleration, can indicate wear in the ring and pinion gears within the differential. This often points to improper gear mesh or worn bearings.
• Carrier Bearing Wear: The carrier bearings support the differential carrier within the axle housing. Worn carrier bearings can produce a rumbling or growling noise that changes with vehicle speed and can be heard from the rear of the vehicle.
• Limited-Slip Differential (LSD) Clutch Pack Wear: If your Sprinter is equipped with an optional limited-slip differential, the clutch packs can wear out over time. Symptoms might include chattering or clunking noises during turns, or a decrease in traction when one wheel loses grip.

Regular differential fluid changes with the correct specification fluid can help mitigate these issues and prolong the life of your axle components.

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