Home › CDL Practice Tests › General Knowledge Questions › Question 121
A steady vibration that grows with road speed, felt through the seat and floor, most often points to trouble in which area?
- A.The driveshaft, universal joints, or a tire and wheel problem
- B.The windshield wiper linkage
- C.The fuel cap seal
- D.The cab air filter
Correct answer
A. The driveshaft, universal joints, or a tire and wheel problem
Why
Parts that spin at road speed, such as the driveshaft and its U-joints, produce speed-related vibration when they wear or come loose. A failing U-joint can let the shaft drop, so the symptom belongs on a repair report, not on a list of things to live with.
Manual topic: Vehicle Systems - Drivetrain · From the General Knowledge practice bank (GK-121).