Which symptom would indicate a worn U-Joint?

Which symptom would indicate a worn U-Joint?

• A. Chirp at start
• B. Vibration at highway speed
• C. Noise when braking
• D. Chirp or squeak when starting from a stop

Answer: (D)

A worn U‑joint often shows up as a noise when the vehicle first starts to move because that’s when torque is applied through the driveshaft and the joint begins to rotate. If the joint is dry or has developed play in the cross bearing, the initial movement can cause a chirp or squeak as the surfaces rub or bind briefly. This startup noise is a practical clue of joint wear and often prompts inspection of the driveshaft U‑joint for lubrication shortage, looseness, or damage, with replacement or servicing as the remedy. While vibration at highway speed can also indicate U‑joint wear, the chirp or squeak on first movement specifically highlights the joint’s condition as torque is introduced.

A worn U‑joint often shows up as a noise when the vehicle first starts to move because that’s when torque is applied through the driveshaft and the joint begins to rotate. If the joint is dry or has developed play in the cross bearing, the initial movement can cause a chirp or squeak as the surfaces rub or bind briefly. This startup noise is a practical clue of joint wear and often prompts inspection of the driveshaft U‑joint for lubrication shortage, looseness, or damage, with replacement or servicing as the remedy. While vibration at highway speed can also indicate U‑joint wear, the chirp or squeak on first movement specifically highlights the joint’s condition as torque is introduced.