2024 International MV: Transmission & Axle Gear Ratios

When configuring or servicing a medium-duty workhorse like the 2024 International MV, understanding its powertrain specifications is crucial for maximizing productivity, fuel efficiency, and towing capacity. Whether you are outfitting a dump truck, a delivery box van, or a tow truck, the transmission and rear axle ratios dictate how the truck puts its power to the pavement. Below, we break down the transmission and axle gear ratios for the 2024 International MV series.

Transmission gear ratios

The 2024 International MV is highly customizable and typically paired with Cummins B6.7 or L9 engines. The vast majority of these trucks are spec'd with Allison automatic transmissions, specifically the 1000/2000 Series or the heavier-duty 3000 Series. Below are the internal gear ratios for the most common Allison configurations found in the MV.

Allison 2500 RDS (6-Speed Automatic)

This is the standard and most popular transmission for non-CDL and lighter-duty MV applications (like box trucks and flatbeds).

Allison 3000 RDS (6-Speed Automatic)

For heavier payloads, dump bodies, and towing applications usually paired with the Cummins L9, the Allison 3000 Rugged Duty Series provides stronger internals and a lower first gear for getting heavy loads moving.

(Note: Eaton Fuller manual transmissions and Eaton Cummins Endurant automated manual transmissions are also available for specific fleet orders, but the Allison automatics dominate the MV's powertrain lineup.)

Available axle ratios

Medium-duty trucks like the International MV utilize heavy-duty rear axles from manufacturers like Meritor and Dana Spicer. Because of the vast array of vocations the MV serves, rear axle ratios can range from tall highway gears to ultra-short gears for low-speed site work.

How to identify your axle ratio

Unlike consumer light-duty trucks, commercial vehicles like the 2024 International MV do not typically rely on a simple glovebox RPO sticker. Instead, identifying your specific axle configuration requires checking a few commercial-specific locations:

1. The Line Sheet: Every International truck is delivered with a "Line Sheet" (often tucked into the owner's manual binder, printed and adhered to the inside of the glovebox door, or attached behind the driver’s seat). This document lists every specific component built into the truck, including the specific Dana or Meritor rear axle model and the exact gear ratio.
2. The Axle Tag: If the line sheet is missing, crawl under the rear of the truck (safely) and look at the differential housing. Meritor and Dana Spicer both rivet a metal identification tag to the axle housing (usually on the differential cover or on the front of the carrier near the input yoke). This tag will have the ratio stamped on it (e.g., "4.88").
3. VIN Decoder / Dealership: An International Truck dealership can run your truck's 17-digit VIN through their Navistar service portal to give you an exact build sheet.

Towing vs MPG impact

In the world of medium-duty trucking, selecting the correct axle ratio is the difference between a profitable route and a fuel-guzzling nightmare.

• Numerically Lower Ratios (e.g., 3.90, 4.11): Often referred to as "tall" gears, these are best for fuel economy. They allow the engine to run at lower RPMs while maintaining highway speeds. If your International MV is a dry van covering interstate routes, these ratios will yield the best MPG.
• Numerically Higher Ratios (e.g., 4.88, 5.29, 5.57): Known as "short" gears, these provide massive torque multiplication. While your top speed will be limited and fuel economy will suffer on the highway, these gears are essential for towing, dump trucks, and navigating steep grades under full GCWR (Gross Combined Weight Rating).

Common issues

While the driveline components on a 2024 International MV are incredibly robust, heavy-duty commercial use will eventually cause wear. A few things to watch out for include:

• Carrier Bearing Wear: The International MV has a long wheelbase, meaning it utilizes a multi-piece driveshaft supported by center support bearings (carrier bearings). Heavy loads and rough roads can cause these bearings to wear out, resulting in a shudder or vibration during takeoff.
• Ring and Pinion Whine: If the truck is regularly overloaded or if differential fluid changes are neglected, the gear teeth can develop an improper wear pattern. This often manifests as a high-pitched whine under load or on deceleration.
• Wheel Seal Leaks: While not an internal gear issue, leaking rear wheel seals can drain the gear oil out of the axle housing. If left unnoticed, the low fluid level will rapidly destroy the axle bearings and the ring and pinion gears.

Find a driveline shop on Repairius

Servicing heavy-duty commercial axles and transmissions requires specialized tools, heavy-duty lifts, and commercial expertise. If your 2024 International MV is experiencing driveshaft vibrations, leaking axle seals, or you need to re-gear your truck for a different vocation, you need a shop that specializes in medium-duty fleets.

Find a driveline shop on Repairius. Our network includes top-rated commercial truck repair centers that have the equipment and know-how to keep your International MV out of the shop and on the road making money.