2019 Toyota Tacoma Transmission & Axle Gear Ratios

The 2019 Toyota Tacoma is a legendary midsize truck known for its durability, off-road capability, and versatile powertrain options. Whether you are navigating rocky trails, towing a camper, or commuting on the highway, the performance of your Tacoma is heavily dictated by its transmission and axle gear ratios. Understanding these specifications is essential for maximizing your truck's capability, optimizing fuel efficiency, and diagnosing potential driveline issues.

Below is a comprehensive guide to the transmission options, axle ratios, and driveline specifications for the 2019 Toyota Tacoma.

Transmission gear ratios

For the 2019 model year, Toyota offered the Tacoma with two primary transmissions: a 6-speed automatic (available with both the 2.7L 4-cylinder and the 3.5L V6) and a 6-speed manual (exclusive to select 3.5L V6 TRD models). The automatic transmission is tuned for smooth highway cruising, while the manual offers a more engaging experience with slightly shorter gearing for off-road control.

6-Speed Automatic Transmission (AC60E / AC60F) Available on 2.7L 4-Cylinder and 3.5L V6 models.

6-Speed Manual Transmission (RC62F) Available on 3.5L V6 TRD Sport, TRD Off-Road, and TRD Pro models.

Available axle ratios

The final drive ratio (axle ratio) works in tandem with your transmission to determine wheel torque and engine RPM at any given speed. Unlike domestic trucks that offer a wide menu of gear ratios, Toyota simplifies the process by pairing specific axle ratios directly to the engine and transmission combination.

How to identify your axle ratio

If you are unsure which differential is installed in your 2019 Toyota Tacoma, there are several simple ways to identify your exact axle ratio:

1. The Door-Jamb Sticker Unlike GM vehicles that use a glovebox RPO sticker, Toyota places its vital driveline information on the federal compliance sticker located on the driver's side door jamb. Look toward the bottom of the sticker for a line that begins with C/TR/A/TM (Color/Trim/Axle/Transmission). The "A" value is your axle code. For example, an axle code of A04A or B04A typically indicates the 3.909 ratio, while A03A or B03A indicates the 4.30 ratio.

2. Physical Axle Tag If the door sticker is missing or illegible, you can often find a metallic identification tag bolted directly to the rear differential housing. This tag will be stamped with the gear ratio (e.g., "3.90" or "4.30") and ring gear size. Be prepared to wipe away dirt or surface rust to read it clearly.

3. VIN Decoder For the most foolproof method, run your 17-digit Vehicle Identification Number (VIN) through a Toyota dealership parts department or a reliable online VIN decoder. This will pull the exact build sheet for your truck, confirming the factory axle ratio and whether it is equipped with a locking rear differential (standard on TRD Off-Road and TRD Pro).

Towing vs MPG impact

Your truck's axle ratio is a major factor in how it behaves under load and at highway speeds.

Numerically Lower Ratios (e.g., 3.909) A numerically lower gear ratio means the driveshaft turns fewer times for every complete rotation of the tires. This keeps the engine RPMs lower at highway speeds, which translates directly to better fuel economy and a quieter cabin. The 3.909 ratio paired with the V6 automatic is Toyota's balanced approach, providing adequate pulling power while maximizing MPG for daily commuting.

Numerically Higher Ratios (e.g., 4.30) A numerically higher gear ratio means the engine revs higher at the same wheel speed. This multiplies engine torque before it reaches the wheels, providing significantly better towing performance, improved acceleration off the line, and superior low-speed control for off-roading. The 4.30 gears in the manual V6 and 4-cylinder models help compensate for taller manual transmission gearing or the lower power output of the 4-cylinder engine.

Common issues

The 2019 Toyota Tacoma powertrain is notoriously robust, but there are a few known driveline issues that owners should be aware of:

• Front Differential Needle Bearing Vibration: Many 3rd-generation Tacomas (especially those with suspension lifts) experience a cyclical rumble or vibration from the front differential driver-side needle bearing. Upgrading to an aftermarket ECGS (East Coast Gear Supply) clamshell bushing is a common and highly recommended fix.
• Rear Differential "Howl": Some owners report a distinct whining or howling noise from the rear differential between 45 and 60 mph. This is usually caused by improper ring and pinion gear backlash from the factory or premature carrier bearing wear.
• Transmission "Gear Hunting": While not a mechanical failure, the 6-speed automatic paired with the 3.909 axle ratio is infamous for "hunting" between 5th and 6th gear on slight inclines or highway driving. Many owners resolve this by installing aftermarket powertrain tunes (like the OVTune) to adjust shift points, or by re-gearing the axles to 4.88 or 5.29 if running larger tires.

If you suspect gear wear, carrier bearing issues, or want to re-gear your truck for larger tires, professional setup is required. Find a driveline shop on Repairius.