2022 International MV — Transmission & Axle Gear Ratios

Transmission gear ratios

The 2022 International MV is a versatile medium-duty truck available with a range of transmission options, primarily focusing on vocational and fleet applications. The most common offerings include automatic transmissions from Allison Transmission.

Allison 2500 Series (e.g., 2500 RDS - Rugged Duty Series)

This is a popular choice for its durability and smooth operation, often paired with the Cummins B6.7 engine.

(Note: Specific ratios can vary slightly depending on the exact Allison model and calibration. Always confirm with your vehicle's documentation.)

Available axle ratios

International MV trucks are available with a wide array of axle ratios to suit diverse operational needs, from regional delivery to heavy-duty vocational work. These ratios are typically chosen based on the intended use, engine power, and desired performance characteristics.

(Note: Axle ratios are highly dependent on the specific chassis configuration, engine, and transmission choice. Consult your dealer or vehicle documentation for confirmed ratios.)

How to identify your axle ratio

For International MV trucks, the most reliable way to identify your specific axle ratio is through the vehicle's RPO (Regular Production Option) sticker or by checking the axle itself.

RPO Sticker: On International trucks, the RPO sticker is typically located on the driver's side door jamb, inside the glove box, or occasionally under the hood. Look for a series of three-digit codes. The axle ratio will be indicated by a specific code (e.g., a common format might be a three-digit alphanumeric code that correlates to the specific ratio, or a numerical representation like "3.58"). You may need to cross-reference this code with an International RPO decoder or consult a dealer.

Axle Tag: If the RPO sticker is missing or unreadable, the axle itself usually has a metal tag bolted to one of the differential cover bolts. This tag will contain information such as the manufacturer (e.g., Meritor, Dana), model, and the gear ratio stamped directly on it (e.g., "3.58", "4.10"). Be aware that these tags can become corroded or covered in grime over time.

VIN Decoder: While less common for detailed axle ratios, a comprehensive VIN decoder tool or an International dealer can often provide build sheet information, including the original axle ratio, using your truck's 17-digit Vehicle Identification Number (VIN).

Towing vs MPG impact

Choosing the correct axle ratio is a critical decision for optimizing your 2022 International MV's performance for its intended application:

• Numerically Lower Ratios (e.g., 3.07, 3.31): These ratios mean the engine turns fewer revolutions for every rotation of the wheels. This results in better fuel economy at highway speeds, as the engine operates at lower RPMs. However, it translates to reduced torque multiplication at the wheels, meaning less power for starting heavy loads or climbing steep grades. This is ideal for trucks primarily used for light loads, regional hauling, or applications where highway efficiency is paramount.

• Numerically Higher Ratios (e.g., 3.91, 4.10, 4.33): These ratios cause the engine to turn more revolutions for every rotation of the wheels. This provides significantly increased torque multiplication, making the truck more capable of starting heavy loads, pulling trailers, and performing well in stop-and-go vocational settings or on challenging terrain. The trade-off is lower fuel economy due to higher engine RPMs at cruising speeds. These ratios are best suited for heavy-duty towing, construction, refuse collection, or any application requiring maximum pulling power.

Balanced Ratios (e.g., 3.58): These ratios aim to strike a balance between fuel efficiency and towing capability, offering good all-around performance for a variety of tasks.

Common issues

While robust, axle assemblies can experience wear and tear. Some common issues to be aware of across various heavy-duty axles include:

• Ring and Pinion Whine: A persistent high-pitched whine, especially noticeable at certain speeds or under acceleration/deceleration, can indicate wear or improper setup of the ring and pinion gears. This often necessitates disassembly for inspection and replacement.
• Carrier Bearing Wear: The bearings supporting the differential carrier can wear out, leading to growling noises, vibration, or even differential failure if left unaddressed. Regular maintenance and proper lubrication are key to longevity.
• Limited-Slip Clutch Wear (if equipped): If your axle features a limited-slip differential, the internal clutches can wear over time, reducing its effectiveness in providing traction to both wheels. This might manifest as a loss of traction in slippery conditions or chattering during turns.
• Leaking Pinion Seal: The seal around the pinion shaft can degrade, leading to oil leaks. While not immediately catastrophic, a low fluid level can cause accelerated wear to the gears and bearings.

Regular differential fluid checks and changes, as per manufacturer recommendations, are crucial for preventing premature wear and extending the life of your International MV's axle assembly.

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