2022 Chevrolet Silverado 2500HD Transmission & Axle Gear Ratios

Transmission gear ratios

The 2022 Chevrolet Silverado 2500HD offers two robust transmission options, each designed to handle the heavy demands of a ¾-ton truck. The 6-speed automatic transmission is paired with the 6.6L gasoline V8 engine, while the mighty Allison® 10-speed automatic transmission is exclusively mated to the 6.6L Duramax® turbodiesel V8.

6-speed Automatic Transmission (MYD)

Allison® 10-speed Automatic Transmission (MGM)

Available axle ratios

The 2022 Silverado 2500HD offers different axle ratios to optimize performance based on the engine and intended use. The standard axle ratio for gasoline models is optimized for a balance of towing and everyday driving, while the Duramax® models receive a ratio that maximizes their substantial towing capabilities.

How to identify your axle ratio

For Chevrolet trucks, the easiest way to determine your vehicle's axle ratio is by checking the RPO (Regular Production Option) sticker. This sticker is typically found on the inside of the glove box door, though sometimes it can be located on the driver's side door jamb or under the hood. Look for a three-digit code: GT4 signifies a 3.73:1 ratio, and GT5 indicates a 3.42:1 ratio. These codes are part of a long list of alphanumeric codes that describe all the options and specifications your truck was built with from the factory. If the sticker is missing or unreadable, a Chevrolet dealership can provide this information using your VIN.

Towing vs MPG impact

Axle ratios play a significant role in how your truck performs, particularly in terms of towing capability and fuel efficiency. A numerically higher axle ratio (like 3.73:1) means the engine will turn more revolutions per minute (RPM) for a given road speed. This results in greater torque multiplication at the wheels, providing more pulling power and improved responsiveness, which is ideal for heavy towing or frequent hauling. However, this increased RPM at cruising speeds typically translates to lower fuel economy.

Conversely, a numerically lower axle ratio (like 3.42:1) reduces engine RPM at highway speeds. This decreases engine workload for a given speed, leading to better fuel economy during unloaded driving. While it may slightly reduce the absolute maximum towing capacity compared to a higher ratio, modern heavy-duty transmissions with numerous gears (like the Allison 10-speed) can largely compensate for this, still offering exceptional towing capability with a lower ratio.

The 2022 Silverado 2500HD is engineered to provide excellent performance regardless of the axle ratio, with the factory selecting the optimal ratio based on the engine to deliver a balanced overall package.

Common issues

While the transmissions and axles in the 2022 Chevrolet Silverado 2500HD are built for durability, certain issues can occur over time, particularly in heavily used or high-mileage vehicles. Signs of potential axle issues include:

• Ring and Pinion Whine: A persistent howling or whining noise that changes with vehicle speed and throttle input can indicate wear or improper setup of the ring and pinion gears. This is often more noticeable at certain speeds or loads.
• Carrier Bearing Wear: The carrier bearings support the differential carrier within the axle housing. Worn carrier bearings can produce a growling or rumbling noise, especially when turning or accelerating, and may lead to excessive play in the driveshaft.
• Limited-Slip Clutch Wear: If your Silverado is equipped with a limited-slip differential, the internal clutches can wear out over time. Symptoms include a chattering or clunking noise from the rear end when turning sharply at low speeds. This can reduce the effectiveness of the limited-slip feature.

Regular differential fluid changes with the correct fluid type are crucial for preventing these issues and extending the life of your axle components.

Find a driveline shop on Repairius.