2022 Ford F-350 Super Duty — Transmission & Axle Gear Ratios

When it comes to heavy-duty trucks, the powertrain configuration dictates everything from unladen fuel economy to maximum towing capacity. The 2022 Ford F-350 Super Duty is an absolute powerhouse, offering incredible payload and towing figures. However, maximizing its potential requires the right combination of engine, transmission, and axle ratios.

Below is a comprehensive guide to the 2022 Ford F-350 Super Duty transmission and axle gear ratios to help you understand your truck's mechanical setup.

Transmission gear ratios

For the 2022 model year, the Ford F-350 Super Duty predominantly utilizes the heavy-duty TorqShift 10-speed automatic transmission (the 10R140). Co-developed with GM but heavily fortified by Ford for Super Duty applications, this transmission offers exceptional torque multiplication in lower gears while featuring three overdrive gears for highway cruising.

Here are the internal gear ratios for the TorqShift 10-speed automatic transmission:

Note: The 10R140 is standard on all F-350s equipped with the 7.3L gas V8 and 6.7L Power Stroke V8, as well as the base 6.2L V8.

Available axle ratios

Your rear axle ratio determines the final drive rotational speed before the wheels. A numerically higher ratio provides more torque but runs the engine at higher RPMs. Ford offers a wide range of ratios for the 2022 F-350, largely dependent on the engine choice (6.2L Gas, 7.3L Gas, or 6.7L Diesel) and the rear-wheel configuration (Single Rear Wheel/SRW or Dual Rear Wheel/DRW).

How to identify your axle ratio

If you are unsure which differential gear ratio your 2022 F-350 Super Duty is equipped with, there are three primary ways to find out:

1. Door-Jamb Sticker (Safety Compliance Certification Label): Open your driver's side front door and look for the manufacturer's sticker. At the bottom right, you will see a field labeled AXLE. There will be a two-character alphanumeric code. For example, "3J" means a 3.55 Electronic Locking rear axle, while "3E" means a 3.73 Electronic Locking axle.
2. Rear Axle Tag: Ford traditionally attaches a metal tag to one of the differential cover bolts. You may need to clean it off with a rag, but the bottom line of the tag will start with the ratio (e.g., "3 55" or "3L55" if it's a limited slip/locker).
3. VIN Decoder: Running your 17-digit Vehicle Identification Number (VIN) through a Ford dealership or a reliable online VIN decoder will pull up your truck's original build sheet, confirming both transmission type and axle ratio.

Towing vs MPG impact

When selecting or evaluating a truck's drivetrain, understanding the relationship between the axle ratio, fuel economy, and towing capacity is crucial.

• Numerically Lower Ratios (e.g., 3.31, 3.55): These are often referred to as "tall" gears. They allow the wheels to turn faster for a given engine RPM. This results in significantly better highway fuel economy (MPG) and less engine wear during unladen cruising. However, it provides less mechanical advantage when getting a heavy load moving from a dead stop. Thanks to the massive 1,050 lb-ft of torque generated by the 6.7L Power Stroke, diesel F-350s can easily run a 3.31 or 3.55 ratio while still towing incredible amounts.
• Numerically Higher Ratios (e.g., 4.10, 4.30): Known as "short" gears, these provide maximum torque multiplication to the wheels. If you are hauling massive fifth-wheel RVs, heavy construction equipment, or running oversized tires, a 4.10 or 4.30 is highly recommended. The trade-off is lower fuel economy, as the engine will sit at a higher RPM while traveling at highway speeds.

Common issues

The driveline in the 2022 F-350 is built for extreme duty, but owners should still be aware of a few potential issues:

• Electronic Locking Differential (E-Locker) Actuator: The electronic lockers are robust, but electrical connection faults or a failing actuator coil can sometimes prevent the locker from engaging or disengaging smoothly.
• Ring and Pinion Whine: If the truck has been used for severe towing right out of the box without following the recommended 500-mile break-in period for the ring and pinion gears, you may develop a pronounced whine during acceleration or deceleration.
• Carrier Bearing Wear: On long-wheelbase F-350s with a two-piece driveshaft, a heavy load combined with poor road conditions can accelerate wear on the center support (carrier) bearing, leading to a noticeable vibration at speeds between 30 and 50 mph.

Find a driveline shop on Repairius

If your 2022 Ford F-350 Super Duty is experiencing differential whine, transmission shifting issues, or you want to re-gear your truck for larger tires, trust a professional to handle the heavy lifting. Find a driveline shop on Repairius today to get your Super Duty performing at its absolute best.