Road Tests

Vehicle Road Test Evaluation Form:

A road test is mandatory for any customer concern of noise/vibration that is not verified by the on-hoist check of chassis components. The Vehicle Road Test Evaluation form is arranged to record the conditions heard or felt during this test.

The Road Test Form lists four operating conditions or modes in which some axle noises come and go: DRIVE, CRUISE, COAST, and FLOAT.

Road Test Form:

Operate the vehicle in all four modes and record those in which the noise occurs. Write down the kilometers-per-hour (miles-per-hour) range at which both noise and vibration occur. Evaluate rear axle noise with the transmission in DIRECT DRIVE and not in OVERDRIVE. Transmission noise can be mistaken for rear axle noise when in OVERDRIVE.