Posted on 11/28/2025
A healthy rear differential works quietly in the background. It lets the left and right wheels turn at different speeds in corners and sends power to the pavement without drama. When fluid breaks down or parts wear, the clues start small. Catching them early keeps the ring and pinion happy, prevents axle seal leaks, and avoids the kind of noise that makes highway drives stressful. 1. Whine or Howl That Changes With Speed A rising whine between 30 and 60 miles per hour often points to gear wear or low fluid. If the pitch changes as you lift off the throttle, that is another clue the sound is coming from the ring and pinion rather than the tires. Fresh fluid can quiet a mild whine, especially if service is overdue. A loud, steady howl suggests wear has progressed, and the gear pattern needs a professional look. 2. Clunks When You Shift From Park to Drive A single clunk as the vehicle takes up load can come from worn differential bushings, excessive b ... read more