Commercial Trucks and Busses

 We worked with Allison Transmission to develop a quick, easy to use, accurate vibration diagnostic tool for the entire commercial truck and automotive industry. The result is NVH version 3.0! 

The NVH app has been enhanced with 25 new features to quickly diagnose commercial truck vibrations

Commercial trucks and busses are fully supported by the NVH app.  Any Class 4-8 truck or bus with the following axles and transmissions are directly supported by the NVH app. Other truck axles and transmissions can also be used, but the user of the app is required to supply their truck’s own gear ratios.

Transmissions (1205 Models)

  • Allison: 3 – 10 Speed Transmissions
  • Detroit: 12 Speed Transmissions
  • Eaton/Fuller: 5 – 18 Speed Transmissions
  • PACCAR – 12 Speed Transmissions
  • Tremec: 5 – 18 Speed Transmissions
  • Volvo/Mack: 9 – 14 Speed Transmissions
  • ZF Meritor: 9 – 16 Speed Transmissions

Axles (381 Models)

  • Dana Spicer Axles
    • Single Axles
    • Tandem Axles
    • Tridem Axles
  • Detroit Axles
    • Single Axles
    • Tandem Axles
  • Eaton Spicer Axles
    • Single Axles
    • Tandem Axles
  • ZF Meritor Spicer Axles
    • Single Axles
    • Tandem Axles
    • Tridem Axles
Class 4-8 Trucks iPad
Class 4-8 Trucks

NOTICE: Electric Vehicles (EV) have fewer moving parts than a traditional Internal Combustion Engine (ICE) and transmission equipped vehicle. There is still a possibility of an EV experiencing a tire speed related vibration or an electric motor speed related vibration. The NVH app is great at detecting tire speed related vibrations, but detecting electric motor speed related vibrations has some limitations depending on the vehicle’s gear reduction gear ratio and the hardware in your phone or tablet**.

Although electric motor vibrations are very rare on vehicles, the electric motors in some electric vehicles rotate at a very high RPM at highway vehicle speeds. The ability of the NVH app to measure electric motor vibrations above 100 Hz (6000 RPM) can be limited by the iPhone/iPad hardware, not the app. It is still possible that electric motor vibrations will be detectable at lower vehicle speeds.

**Apple iOS devices with NVH version 4.0 or higher are electric vehicle-ready. The NVH for Android app does not support electric vehicles. 

What the app can do

The NVH app is designed to automatically detect the type of vibration your vehicle is experiencing, provided the instructions of the road test procedure are followed.

There are 14 types of vibrations the NVH app can automatically detect:

  • Tire speed-related (1st, 2nd, and 3rd order vibrations)
  • Driveshaft speed-related (1st, 2nd, and 3rd order vibrations)
  • Engine speed-related (0.5, 1st, 2nd, 3rd, 4th, 5th, and 6th order vibrations)
  • Electric Motor Speed Related (1st order vibrations)

Each type of vibration has unique causes. A vibration type is not the same thing as a vibration source. There are many possible causes (sources) for each vibration type. The NVH app includes step-by-step instructions on locating the vibration source once the app has identified the type of vibration.

What the app cannot do

  •  The NVH App cannot automatically tell you the source of a vibration
  • Although the NVH app is excellent at identifying the type of vibration your vehicle is experiencing, you or someone else will need to follow the diagnostic steps described in the app help files to identify the exact cause or source of the vibration.

There are almost 300 possible sources of vibration concerns in today’s vehicles

T1 Diagnostic Help


Turn your Phone or Tablet into a Vibration diagnostic tool! Purchase our new App to use the internal sensors of your Phone or Tablet to diagnose the type of vibration your car or truck is experiencing. There are close to 300 individual vibration sources on a typical vehicle; the NVH App knows each one of them and can guide you through the entire diagnostic and repair procedures for each one of them.

What issues have you had with diagnosing vibration, harshness and noise issues?

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