2016 Isuzu NQR: Transmission & Axle Gear Ratios

Transmission Gear Ratios

The 2016 Isuzu NQR is equipped with the Aisin A465 6-speed automatic transmission, a robust and reliable gearbox designed for commercial use. This transmission provides a wide spread of ratios to balance startup torque with highway fuel economy.

Aisin A465 6-Speed Automatic

Available Axle Ratios

Isuzu offers specific axle ratios for the NQR to tailor its performance to different applications, whether the priority is hauling heavy loads or maximizing fuel efficiency during long-distance hauls.

How to Identify Your Axle Ratio

Knowing your truck's specific axle ratio is crucial for ordering the correct driveline parts or understanding its performance characteristics. There are a few ways to definitively identify it for your 2016 NQR.

• VIN/Specification Plate: The most reliable method is to check the specification plate, typically located on the driver's side door jamb or on the B-pillar. This plate contains a wealth of information, including the VIN, GVWR, and specific build codes. Look for the "Axle" code section, which will display the code corresponding to your installed ratio (e.g., F13 or F14).
• VIN Decoder: Online VIN decoders can be a useful tool. By entering your vehicle's 17-digit VIN, you can often retrieve a detailed build sheet that specifies the factory-installed axle ratio.

Towing vs. MPG Impact

The axle ratio has a direct and significant impact on both your truck's towing capability and its fuel consumption. The principle is straightforward:

• Numerically Higher Ratios (e.g., 5.12): This is known as a "shorter" gear. The engine needs to turn more revolutions for every rotation of the wheels. This multiplication of torque makes it much easier to get a heavy load moving from a standstill and to pull trailers up steep grades. The trade-off is higher engine RPM at highway speeds, which leads to increased fuel consumption.
• Numerically Lower Ratios (e.g., 4.56): This is a "taller" gear. The engine turns fewer revolutions for every wheel rotation. This results in lower engine RPM on the highway, reducing engine strain and significantly improving fuel economy. The compromise is reduced pulling power, which may make the truck feel more sluggish when starting with a heavy load.

For the 2016 Isuzu NQR, the standard 4.56 ratio provides a good middle ground for general-purpose use, while the optional 5.12 ratio is the clear choice for businesses that specialize in heavy hauling and frequent towing.

Find a Driveline Shop on Repairius

Whether you need to diagnose a noise, service your differential, or re-gear your axle for a different application, proper driveline service is key to your truck's reliability. Use Repairius.com to find a qualified heavy-truck repair shop near you that specializes in transmission and axle work.