2016 Volvo VNL Transmission & Axle Gear Ratios

Transmission gear ratios

The 2016 Volvo VNL was available with a range of transmissions, primarily focusing on automated manual transmissions (AMTs) for efficiency and driver comfort. The most common options were the Volvo I-Shift, Eaton Fuller Advantage, and Eaton Fuller UltraShift PLUS. Each offered unique gear sets tailored for various applications from long-haul cruising to vocational tasks.

Volvo I-Shift (ATO2612D, ATO2612E, ATO2612F)

The Volvo I-Shift is a 12-speed automated manual transmission known for its smooth shifts and predictive capabilities. It was a popular choice across the VNL lineup.

Eaton Fuller Advantage (FO-16E310C-VCS)

The Eaton Fuller Advantage transmissions were designed for fuel efficiency in line-haul applications, featuring intelligent shift strategies and lightweight components.

Eaton Fuller UltraShift PLUS (FRO-16210C-VCS)

Another prominent offering from Eaton, the UltraShift PLUS series provided robust performance and efficiency for various applications, including vocational and heavy-haul.

Available axle ratios

Axle ratios are crucial for tailoring the 2016 Volvo VNL to specific operational needs, balancing between fuel efficiency for long-haul and pulling power for heavier loads or varied terrain.

Please note: Volvo does not typically use specific RPO codes directly correlating to the axle ratio on a door jamb sticker like some other manufacturers. The full axle specification including ratio is usually found on the build sheet or by decoding the VIN.

How to identify your axle ratio

Identifying the exact axle ratio on your 2016 Volvo VNL is crucial for maintenance, repairs, and understanding your truck's capabilities. Unlike some pickup trucks that use simple RPO codes, heavy-duty trucks like the VNL often require a bit more digging.

1. VIN Decoder / Build Sheet: The most accurate method is to use your VIN (Vehicle Identification Number) to access the original build sheet from a Volvo dealer or an online VIN decoder service. The build sheet will list all original specifications, including the exact axle ratio and differential model.

2. Axle Tag: Look for a metal tag attached to one of the differential cover bolts or on the axle housing itself. This tag contains manufacturing information, and often the axle ratio is stamped or printed on it. It might be in a format like "3.08" or "3.08:1." The tag can be obscured by dirt and grease, so a good cleaning might be necessary.

3. RPO Sticker (Limited for Ratio): While Volvo trucks do have RPO (Regular Production Option) stickers, typically found on the driver's side door jamb or inside the glove box, these usually list major components and options. While you might find codes relating to the axle model (e.g., Meritor, Dana), the actual numerical ratio is less commonly directly stated with a simple RPO code on the sticker itself. It's more for identifying axle type and capacity.

Towing vs MPG impact

Numerically lower axle ratios (e.g., 2.64, 2.79, 3.08): These ratios mean the driveshaft turns fewer times for each rotation of the wheel. This results in lower engine RPMs at highway speeds, leading to improved fuel economy. Trucks equipped with these ratios are best suited for long-haul operations with lighter loads or where flat terrain is common.

Numerically higher axle ratios (e.g., 3.42, 3.58): These ratios mean the driveshaft turns more times for each rotation of the wheel. This provides more torque multiplication at the wheels, enhancing pulling power and acceleration, especially with heavy loads or on hilly terrain. The trade-off is higher engine RPMs at highway speeds, which generally leads to decreased fuel economy. These ratios are ideal for heavy-haul, vocational applications, or operations in mountainous regions.

Choosing the right axle ratio significantly impacts the operational efficiency and capability of your 2016 Volvo VNL. It's a balance between maximizing fuel efficiency and having the necessary power for your typical hauling requirements.

Common issues

Axle and differential components in heavy-duty trucks like the Volvo VNL are built for durability, but they can experience wear and tear over time. Common issues include:

1. Ring & Pinion Whine: A persistent whining noise that changes with road speed and load can indicate wear on the ring and pinion gears. This is often caused by improper gear mesh, worn bearings, or inadequate lubrication.

2. Carrier Bearing Failure: The carrier bearings support the differential carrier within the axle housing. Failure can lead to excessive play, vibration, and noise, eventually causing damage to the gears. A grinding or rumbling sound is a common symptom.

3. Limited-Slip Clutch Wear (if equipped): If your VNL is equipped with a limited-slip differential, the clutch packs can wear out. Symptoms include a chattering or clunking noise during turns, or a perceived lack of traction from one wheel when slippage occurs.

4. Leaking Seals: Pinion seals and axle shaft seals can degrade over time, leading to lubricant leaks. While not immediately catastrophic, unchecked leaks can lead to low fluid levels, potentially causing accelerated wear to internal components.

Regular maintenance, including proper lubricant changes and timely inspection, can help mitigate these issues and extend the life of your VNL's driveline components.

Find a driveline shop on Repairius.