Differential gears and bearings operate under significant loads and depend on the correct lubricant and proper internal setup. Low or contaminated fluid, excessive heat, heavy loads, improper adjustment and normal wear over time can all contribute to deterioration.
Noise does not necessarily tell you which internal component is worn. Certified Transmission in Bellevue can inspect and diagnose the differential to determine the condition of the gears, bearings and related components before recommending repairs.