Isolate Noise - Isuzu 76mm

Many noises believed to be coming from the transaxle may actually originate at other sources, such as tires, road surfaces, wheel bearings, the engine, or exhaust system.

These noises may vary by vehicle size, type, and amount of body insulation used. Therefore, a thorough and careful check should be made to determine the source of the noise before disassembling the transaxle. Noise which originates in other places cannot be corrected by adjustment or replacement of parts in the transaxle.

Transaxle gears, like any mechanical device are not absolutely quiet and will exhibit some normal operating noise.

The following is a suggested approach to verify suspected transaxle noises:
1. Select a smooth, level asphalt road to reduce tire and resonant body noise.
2. Drive vehicle far enough to thoroughly warm up all lubricants.
3. Record the speed at which noise occurs and the gear range that the transaxle is in at the time.
4. Check for noises with engine running and vehicle stopped.
5. Determine in which of the following drive conditions noise is occurring:
a. Drive - light acceleration or heavy pull.
b. Float - maintaining constant vehicle speed at light throttle on a level road.
c. Coast - partly or fully closed throttle with transaxle in gear.
d. All of the above.
6. After road testing the vehicle, refer to the "Diagnosis Chart."