Which Transmission is Best for Your Truck?
What transmission is best for my trucking business?
Automated Manual Transmission
Drivers are an integral part of business and whether or not a truck can obtain the best fuel economy. Generally an automated manual transmission will have a 1-3% improvement over a manual configuration. There is an even larger improvement for applications requiring frequent shifting. Automated technology optimizes shift calibrations, has optional neutral coast and minimizes the need to use manual model mode.
Overdrive vs. Direct Drive Transmission
If the vehicle is driven in top gear on highway routes, or relatively flat ground, for 80 percent of it’s operating time, a direct drive is the more efficient option. When routes are hilly, or sometimes off-road, the overdrive becomes a better fit.
Tips for Selecting the Best Gear Ratios:
- The C-Ratio (73:1) is ideal for customers that require optimum startability and haul a heavier load or on frequent grades. This series is not ideal for downspeeding due to the 37 percent step down in gears between 10th and 9th.
- The S-Ratio (8:1) is ideal for trucks that encounter some hills and would benefit from the fuel economy benefits in downspeeding. This is available only on AMTs due to the small steps between the two top gears.
- The B-Ratio (1:1) is ideal for vehicles that can work in direct drive 80 percent of the operation time, with 1550 lb-ft engines or less. While the B-Ratio sees a 1 percent fuel economy improvement over C and S-Ratios, you have to weigh its benefits against increased driveline and axle costs due to higher torque requirements.