2025 Nissan Altima — Transmission & Axle Gear Ratios

The 2025 Nissan Altima is a staple in the midsize sedan segment, known for its efficiency, comfort, and available Intelligent All-Wheel Drive. Unlike trucks or performance vehicles that utilize traditional stepped-gear transmissions and solid rear axles, the Altima relies on Nissan’s Xtronic Continuously Variable Transmission (CVT) and integrated transaxles.

Understanding the gear ratios and final drive (axle) ratios of your 2025 Altima is essential for diagnostic purposes, transmission replacement, or tuning. Below is a comprehensive breakdown of the powertrain specifications for the 2025 Nissan Altima.

Transmission gear ratios

The 2025 Nissan Altima is exclusively equipped with the Xtronic CVT. Because it is a continuously variable transmission, it does not have traditional fixed gears (like a 6-speed or 10-speed automatic). Instead, it uses a steel belt and pulley system to provide an infinite number of gear ratios between its lowest and highest mechanical limits.

However, Nissan programs these CVTs with "simulated" stepped gears to provide a more traditional driving feel under heavy acceleration. Below are the physical ratio boundaries of the Xtronic CVT paired with the standard 2.5L 4-cylinder engine.

Note: The transmission continuously adjusts the ratio between 2.631 and 0.378 based on throttle input, vehicle speed, and load.

Available axle ratios

Because the Altima is a front-wheel-drive (FWD) based vehicle, it does not have a traditional solid rear axle like a pickup truck. Instead, it uses a transaxle with an integrated final drive ratio. On Intelligent AWD models, a power transfer unit (PTU) sends torque to a rear differential.

Below are the final drive (axle) ratios for the 2025 Nissan Altima lineup.

How to identify your axle ratio

While modern front-wheel-drive sedans don't typically offer a wide menu of axle ratios like a heavy-duty truck, you may still need to verify your final drive or transaxle code when sourcing replacement parts.

1. Door-Jamb Sticker: Open the driver’s side front door and locate the vehicle certification label (often called the door-jamb sticker or RPO sticker). On Nissan vehicles, look for the section labeled "TRANS/AXLE." The first part of the code (e.g., RE0F10D) identifies the transmission model, while the second part (e.g., GS48) identifies the final drive ratio (4.829).
2. Axle Tag / Stamping: The transmission housing will have a stamped identification plate or barcode sticker near the bell housing. If you have an AWD model, the rear differential will also feature a sticker or metal tag indicating the part number and ratio.
3. VIN Decoder: The easiest and most accurate way to confirm your Altima's exact driveline configuration is to run the 17-digit Vehicle Identification Number (VIN) through a Nissan dealership parts department or an online VIN decoder.

Towing vs MPG impact

While the Nissan Altima is not designed for heavy towing (it is generally not rated or recommended for towing by Nissan), the principles of axle ratios still apply to its final drive gear:

• Numerically Lower Ratios (e.g., 3.31, 3.55 - "Tall" Gears): Generally provide better fuel economy and lower highway cruising RPMs. The Altima achieves its excellent highway MPG through the CVT’s massive overdrive capability (0.378), effectively acting as a very "tall" final drive at cruising speeds.
• Numerically Higher Ratios (e.g., 4.10, 4.83 - "Short" Gears): Provide better off-the-line acceleration, mechanical torque multiplication, and pulling power. The Altima uses a seemingly high 4.829 final drive to help the 4-cylinder engine get the vehicle moving quickly, relying on the CVT to drop the overall drive ratio once up to speed.

Common issues

When dealing with the Altima's drivetrain, particularly the CVT and AWD systems, keep an eye out for these known issues as the vehicle ages:

• CVT Belt Slippage / Whine: A high-pitched whining noise under acceleration or a shuddering sensation can indicate wear on the CVT's steel push-belt or pulley cones. Fluid maintenance is critical to preventing this.
• AWD Transfer Case Leaks: On AWD models, the PTU (Power Transfer Unit) can develop seal leaks over time. If the fluid runs low, you may hear gear whine from the front passenger side.
• Rear Differential Noise: While rare on newer models, a low hum or whine from the rear of an AWD Altima can indicate worn carrier bearings or ring and pinion wear in the rear differential unit.
• CVT Valve Body Failure: Hesitation, stalling, or failure to simulate gear shifts can be linked to a failing valve body or integrated stepper motor inside the transaxle.

Find a driveline shop on Repairius. If your Nissan Altima is experiencing CVT shudder, differential whining, or you simply need a fluid exchange to keep your drivetrain running smoothly, use Repairius to connect with trusted local transmission and driveline specialists.