What method is used to check U-joint play?

What method is used to check U-joint play?

• A. Start the engine and drive
• B. Shake the driveshaft up and down with the transmission in neutral
• C. Shake the driveshaft side to side with the transmission in gear
• D. Apply the parking brake and pull

Answer: (B)

To check U-joint play, you look for looseness in the driveshaft joint by moving the driveshaft up and down with the transmission in neutral. This position lets the output shaft spin freely, so any wear in the U-joint bearings shows up as noticeable movement. If the joint feels tight with little or no play, it’s usually in good shape. This method isolates the joint from engine and wheel movement, giving a clear indication of wear. Other approaches won’t isolate the joint properly or can be unsafe or irrelevant to the wear you’re checking.

To check U-joint play, you look for looseness in the driveshaft joint by moving the driveshaft up and down with the transmission in neutral. This position lets the output shaft spin freely, so any wear in the U-joint bearings shows up as noticeable movement. If the joint feels tight with little or no play, it’s usually in good shape. This method isolates the joint from engine and wheel movement, giving a clear indication of wear. Other approaches won’t isolate the joint properly or can be unsafe or irrelevant to the wear you’re checking.