Truck Specs

Choose the right rig.

When every second counts, be sure to choose the right truck for your load and route.
Maximize your fuel economy with proper ratio needs and transmission speeds. Browse our inventory that fits your preferences.

Class 8 transmissions


What speed do you need?

Get the best fuel economy.
Choose a rig with the most efficient transmission for your load.

Search Our Inventory by Speed.

9 speed- on/off road transport
low gear is super low for yardwork/ 9th gear top speed of 100mph at 2,150 rpms

10 speed- on road transport

13 speed transmission – can only split the top four

18 speed transmission – can split all of them including reverse

Automatics and Ultrashifts

Automatics and Ultrashifts

The main advantages of the automatic transmission is no interruption of torque to the wheels of the vehicle during gear shifts and less driver skill and training is required.
Shifting mistakes can cause increased wear and tear on a vehicle and significantly affect fuel economy. Automatic and automated transmissions, which require little or no driver training, largely avoid this. These transmissions allow a higher degree of control over driveline optimization in use because they use pre-programmed decision making and not driver discretion to determine gear selection.

Manual transmissions

Manual Transmissions

Shifting a manual transmission is all about timing.

Manual transmissions have been in use the longest, and are highly reliable and are the most economical. Synchronizers have a hard time handling the stress in a big rig, so most truckers prefer a manual transmission. As the gears all may run different engine speeds at the same ground speed, gears can be floated without use of the clutch to shift. The clutch can help break it out of gear, but if torque is on the transmission, you must ease off of loud pedal until the torque is “neutral”, shift to the next gear.If the rpm’s do not match, the gear will not engaged so allow rpm’s to drop and time the gear appropriately. Shifting too fast or too slow can result in a loose or tight tranny. If you have a Jake Brake, you do not want it killing your rpm’s unless you are a very fast shifter. Releasing the accelerator may switch it on, you must “feather” the loud pedal to keep it from being turned on or turn it off and on manually.
The torque interrupt may last 3-5 seconds before full engine power is re-applied. In long-haul applications with relatively small changes in road incline, gear shifts are infrequent and this issue is minor. However, for many applications, torque interrupts require excessive driver effort, increase emissions, and can negatively impact fuel economy. Only an experienced driver should choose a manual transmission.

Class 8 gear ratio

Gear Ratio

What ratio do you need?

Do you need more torque to get up a hill or a higher top speed on the roads?
Find a rig with the most efficient gear ratio for your load.

Search Our Inventory by Gear Ratio.

what ratio do you need

Consider a ratio that works.

Lower Gear Ratio

A lower gear ratio delivers more torque for pulling a heavy loads. The lower the ratio, the more powerful your take off will be and when dropping gears to slow speed, managability of trailer weight is easier.

Higher Gear Ratio

A higher gear ratio will give you a higher top speed and better fuel economy for high speed driving.


Truck Specs

Other Specs

Make & Model

  • Freightliner
  • Kenworth
  • Peterbilt
  • Volvo

Engine Make

  • Caterpillar
  • Detroit
  • Cummins
  • Volvo