Transmission Noisy: Notes

Many noises that appear to come from the transmission may actually originate with other sources such as the tires, road surfaces, wheel bearings, or the engine and exhaust system.

Identify the cause of any noise before attempting to repair the clutch, the transmission, or their related linkages.

To verify suspected transmission noises:

1. Select a smooth, level asphalt road to reduce tire and resonant body noise.
2. Drive the vehicle far enough to warm up all the lubricants thoroughly.
3. Record the speed and the gear range of the transmission when the noise occurs.
4. Check for noises with the vehicle stopped, but with the engine running.
5. Determine if the noise occurs while the vehicle operates in the following:
   • Drive - Under a light acceleration or a heavy pull.
   • Float - Maintaining a constant speed with a light throttle on a level road.
   • Coast - With the transmission in gear and the throttle partly or fully closed.
   • All of the above