2018 Ford Explorer: Transmission & Axle Gear Ratios

Transmission Gear Ratios

The 2018 Ford Explorer comes equipped with a six-speed automatic transmission. However, the specific model and its internal gear ratios depend on the engine choice.

6F35 Six-Speed Automatic (3.5L V6)

6F55 Six-Speed Automatic (2.3L EcoBoost & 3.5L EcoBoost)

Available Axle Ratios

The axle ratio is the final piece of the gearing puzzle, determining how many times the driveshaft turns for every one rotation of the wheels. A higher number means more torque multiplication, which is better for towing, while a lower number means better fuel efficiency at highway speeds.

How to Identify Your Axle Ratio

Knowing your specific axle ratio is crucial for ordering repair parts or understanding your Explorer's capabilities. Here’s how to find it:

• Safety Certification Label: The easiest method is to check the white sticker on your driver's side door jamb. Look for the "AXLE" or "AX" code listed. The code (e.g., Y1, 4) corresponds to the ratio installed at the factory.
• Axle Tag: For confirmation, especially on used vehicles where components may have been swapped, you can look for a metal tag bolted to the differential housing. This tag will have the ratio stamped directly on it (e.g., "3 16" for a 3.16:1 ratio).
• VIN Decoder: While less direct, some online VIN decoders can provide a build sheet for your specific vehicle, which often includes the factory-installed axle ratio.

Towing vs. MPG Impact

The relationship between axle ratios, towing, and fuel economy is a classic trade-off.

• Numerically Higher Ratios (e.g., 3.65:1): These ratios excel at getting a heavy load moving. The engine can rev more easily into its powerband, providing better acceleration and towing performance from a standstill. The downside is that at highway speeds, the engine will be turning at a higher RPM, which consumes more fuel.
• Numerically Lower Ratios (e.g., 3.16:1): These are often called "taller" gears. They are ideal for highway cruising and maximizing fuel economy. The engine runs at a lower, more efficient RPM at speed. However, they can make the vehicle feel less responsive when accelerating or towing, as the engine has less mechanical advantage.

For the 2018 Explorer, the available ratios are fairly close together, meaning the differences in daily driving are subtle but become more apparent when the vehicle is loaded down or on a long highway trip.

Common Issues

The Ford Explorer driveline is generally robust, but like any vehicle, some issues can arise over time and mileage. While not specific to a particular gear ratio, owners should be aware of potential wear items:

• Ring & Pinion Whine: A whining noise that changes pitch with vehicle speed (not engine RPM) can indicate a problem with the ring and pinion gears within the differential. This is often caused by improper backlash or bearing wear.
• Carrier Bearing Failure: In All-Wheel Drive models, the carrier bearing supports the driveshaft. Failure of this bearing can cause a whirring or grinding noise from underneath the center of the vehicle.
• Limited-Slip Clutch Wear: If your Explorer is equipped with a limited-slip differential, the internal clutches can wear out over time, reducing its effectiveness. This might be noticed as a "one-wheel peel" where only one tire spins in low-traction situations.

If you suspect an issue with your vehicle's driveline, it's best to have it inspected by a qualified professional.

Find a driveline shop on Repairius.