2021 Ford Ranger — Transmission & Axle Gear Ratios

The 2021 Ford Ranger has proven itself as a versatile midsize pickup truck, combining an efficient turbocharged engine with a highly capable drivetrain. Understanding your truck’s transmission and axle gear ratios is crucial for maximizing its potential, whether you’re towing a heavy trailer, off-roading, or just trying to get the best possible fuel economy on your daily commute.

Below, you will find a comprehensive guide to the drivetrain specifications of the 2021 Ford Ranger, including internal transmission gearing, available axle configurations, and how these numbers affect your truck's real-world performance.

Transmission gear ratios

For the North American market, the 2021 Ford Ranger comes exclusively with the 10R80 10-speed automatic transmission. Co-developed by Ford and GM, this transmission provides a wide ratio spread that allows for deep reduction in lower gears for initial acceleration and towing, paired with multiple overdrive gears for exceptional highway fuel economy.

Below are the internal gear ratios for the 10R80 10-speed automatic transmission:

With three distinct overdrive gears (8th, 9th, and 10th), the Ranger can cruise at highway speeds while keeping the 2.3L EcoBoost engine at incredibly low RPMs. The aggressive 4.696:1 first gear ensures the truck can get moving easily, even when loaded to its maximum payload or towing capacity.

Available axle ratios

Unlike full-size trucks that offer a dizzying array of differential choices, Ford streamlined the midsize Ranger's powertrain for the North American market. All 2021 Ford Rangers are equipped with a 3.73 rear axle ratio. However, the differentiation comes in the type of differential carrier installed—specifically, whether it is an open differential or an electronic locking differential.

Note: While 3.73 is the standard ratio in the US, international versions of the Ranger equipped with diesel engines may feature different ratios such as 3.15, 3.31, or 3.55.

How to identify your axle ratio

Even though the 2021 Ford Ranger has a standard 3.73 ratio, it is always a good idea to verify exactly what differential your truck is equipped with, especially if you want to confirm the presence of an electronic locking differential. You can easily do this using a few different methods:

1. The Door-Jamb Safety Compliance Label Open the driver’s side front door and locate the Safety Compliance Certification Label on the door jamb. Look along the bottom row of text for the section labeled "AXLE."

• A code of 73 typically denotes a standard 3.73 open differential.
• A code indicating an electronic locking 3.73 differential is usually marked differently, often seen as E3 or similar variants on modern Fords.

2. The Axle Tag Crawl underneath the rear of the truck and look at the differential cover. Ford attaches a small metal tag to one of the bolts holding the cover in place. The first sequence of numbers on this tag will indicate the ratio. For example, "3 73" means an open 3.73 differential, while "3 L 73" indicates a 3.73 locking differential.

3. VIN Decoder If the door sticker is faded or the axle tag is missing, running your 17-digit Vehicle Identification Number (VIN) through an online Ford VIN decoder or calling a local Ford dealership parts department will provide you with the exact build sheet of your truck.

Towing vs MPG impact

Gear ratios represent the relationship between the driveshaft's rotation and the axle shafts' rotation. A 3.73 ratio means the driveshaft must turn 3.73 times to rotate the wheels once. Here is how that impacts your truck:

Numerically Lower Ratios (e.g., 3.15, 3.31): Often referred to as "tall" gears, these are designed for fuel economy. They allow the engine to run at lower RPMs at highway speeds, resulting in better MPG. However, they reduce wheel torque, making them less ideal for heavy towing or quick acceleration.

Numerically Higher Ratios (e.g., 3.73, 4.10): Often called "short" or "deep" gears, these prioritize mechanical torque multiplication. The 3.73 gear in the 2021 Ranger is considered a relatively high numerical ratio for a midsize truck today. When paired with the 10-speed transmission, this ratio gives the Ranger excellent low-end grunt, allowing it to achieve an impressive max towing capacity of 7,500 pounds. The trade-off is slightly higher engine RPMs at cruising speeds, which can nominally lower fuel economy. However, Ford’s inclusion of three overdrive gears in the transmission beautifully offsets this MPG penalty.

Common issues

The Ford Ranger's drivetrain is generally robust, but as trucks accumulate mileage or are subjected to heavy towing and off-road abuse, some issues can arise:

• Ring and Pinion Whine: If you hear a high-pitched whining noise coming from the rear of the truck under acceleration or deceleration, it may indicate improper backlash or wear on the ring and pinion gears.
• Carrier Bearing Wear: A shudder or vibration felt during takeoff (especially when loaded or towing) can sometimes be traced back to a worn center support bearing (carrier bearing) on the two-piece driveshaft.
• Electronic Locker Malfunction: On FX4 and Tremor models, the electronic locking differential may occasionally fail to engage or disengage. This is usually caused by an electrical fault, a damaged wiring harness near the axle, or internal actuator binding rather than a failure of the gears themselves.
• Transmission Harsh Shifting: While not an axle issue, the 10R80 transmission is known to sometimes exhibit clunky or harsh shifts, particularly between gears 3, 4, and 5. This is often resolved with a dealership software flash (PCM/TCM calibration update).

If your Ranger is experiencing driveline vibrations, whining noises, or harsh shifts, getting it looked at by a professional is highly recommended to prevent catastrophic failure.

Find a driveline shop on Repairius to keep your Ford Ranger running smooth and pulling strong for years to come.