| • | The pinion gear shaft | 
| • | The thrust washers | 
| • | The differential case for wear, cracks and scoring | 
| • | The fit of the pinion gear shaft in the differential case | 
| • | The fit of the differential side gears in the differential case | 
| • | The fit of the side gears on the axle shafts | 
| • | Wear | 
| • | Cracks | 
| • | Scoring | 
| • | Spalling |