Condition
| Causes
|
Noise is the same in drive or coast.
|
| • | Front wheel bearing noise. |
| • | Rear wheel bearing noise. |
| • | Incorrect driveline angles. |
|
Noise changes on a different type of road.
|
|
Noise tone is lower as the vehicle speed is lowered.
| Tire noise.
|
Noise is produced with the vehicle standing
and driving.
|
| • | Automatic transmission noise. |
|
Vibration
|
| • | Unbalanced propeller shaft. |
| • | Damaged propeller shaft. |
| • | Worn universal joint in the propeller shaft. |
| • | Incorrect driveline angles. |
|
A knock or a click approximately every two revolutions
of the rear wheel.
| Rear wheel bearing.
|
Noise is
most pronounced on turns.
|
| • | Worn rear tie rod ends. |
|
A continuous low pitch whirring or scraping noise starting
at a relatively low speed.
| Differential drive pinion gear inner
or outer bearing noise.
|
Drive noise, coast noise, or float noise.
| Differential ring gear and differential drive pinion gear noise.
|
Clunk on acceleration or deceleration
|
| • | A worn differential drive pinion gear or differential side gear
hub counterbore worn oversize. |
| • | A worn universal joint on propeller shaft. |
|
Groan in forward or reverse
|
| • | Wrong axle lubricant in axle. |
| • | Differential drive pinion gear bearing worn. |
|
Clunk or knock on rough road operation.
| Worn rear tie rod ends.
|
Noise produced by the ring and pinion gearset is of a cyclic nature.
The following is a list of the noises:
Differential noise always changes when comparing drive and coast. Differential
noise usually ceases when coasting with the transmission in neutral at speeds
under 50 km/h (33 mph).
The noise produced by the differential side gear and pinion gear occurs
when there is an excessive wear between the side gear hubs and the differential
case bores. This can cause a clunking noise when the vehicle is driven at
low speeds. Noise produced due to excessive wear between the gear teeth is
most pronounced on turns.
