2019 Ram ProMaster: Transmission & Axle Gear Ratios

Transmission Gear Ratios

The 2019 Ram ProMaster comes equipped with a single transmission option, the Chrysler 62TE 6-speed automatic transaxle. This transmission is a proven workhorse in the Stellantis (formerly FCA) lineup, known for its smooth shifting and reliability in demanding commercial applications.

Its front-wheel-drive configuration is unique in the full-size van segment in North America, contributing to a lower cargo floor height and improved interior space. The gear ratios are optimized for a balance of city driving and highway efficiency, catering to the typical demands of commercial use, from delivery services to trades.

Chrysler 62TE 6-Speed Automatic

Available Axle Ratios

Unlike traditional rear-wheel-drive trucks and vans, the front-wheel-drive ProMaster uses a "final drive" ratio within its transaxle rather than a separate rear axle differential. This simplifies the driveline and contributes to its unique packaging. For 2019, the Ram ProMaster was offered with two primary final drive ratios, directly linked to the engine choice.

• The 3.86 ratio paired with the standard 3.6L Pentastar V6 engine offers a well-rounded mix of acceleration and fuel economy. It's the most common configuration and is suitable for a wide range of applications, from light-duty hauling to highway cruising.
• The 4.08 ratio was available with the optional 3.0L EcoDiesel inline-four engine. This numerically higher ratio provides superior torque multiplication, making it the better choice for businesses that frequently carry heavy loads or tow trailers. The inherent low-end torque of the diesel engine combined with this gearing makes for effortless starts under load.

How to Identify Your Axle Ratio

Identifying the final drive ratio in a ProMaster is straightforward, but it differs from the process used for traditional rear-wheel-drive trucks.

1. Vehicle Identification Number (VIN) Decoder: The most reliable method is to use a VIN decoder. Numerous online services can provide a full build sheet for your vehicle based on its VIN. This sheet will list all the standard and optional equipment, including the specific final drive ratio installed at the factory.

2. Original Window Sticker (Monroney Label): If you have access to the vehicle's original window sticker, the final drive ratio will be listed under the "Mechanical" or "Standard/Optional Equipment" sections.

Unlike GM or Ford trucks, you won't find RPO codes in the door jamb or a tag on a rear differential housing, as the final drive is an integral part of the front transaxle assembly.

Towing vs. MPG Impact

The relationship between the final drive ratio and vehicle performance is a classic trade-off between power and efficiency.

• Numerically Higher Ratio (e.g., 4.08): This is often called a "shorter" gear. It multiplies the engine's torque more effectively, resulting in better acceleration and increased towing capacity. The engine will rev higher at any given speed, which is beneficial for getting heavy loads moving but leads to higher fuel consumption, especially at highway speeds. This is why it was paired with the torquey EcoDiesel engine, which operates efficiently at lower RPMs.

• Numerically Lower Ratio (e.g., 3.86): This is known as a "taller" gear. It requires less engine RPM to maintain a certain speed. The result is a quieter ride on the highway and significantly better fuel economy. However, the trade-off is less pulling power for towing and hauling heavy loads.

The choice between the two depends entirely on the intended use. For a delivery van running mostly empty or with light packages, the 3.86 ratio with the V6 is ideal. For a contractor carrying heavy tools and materials or a van that regularly tows a trailer, the 4.08 ratio of the EcoDiesel model would be the superior choice.

Common Issues

The 62TE transmission is generally considered robust, but like any component, it can have issues. Some owners have reported transmission problems, sometimes leading to complete failure. Symptoms can include harsh shifting, slipping between gears, or a complete loss of drive. Regular fluid changes and inspections are crucial for longevity. The EcoDiesel engine, while powerful, has also been a source of some reliability concerns for owners, though the final drive unit itself is not a common point of failure.

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