ASE T3 Drivetrain Exam Prep practice questions and answers 2026. Tap an option to test yourself — you'll see the correct answer and a plain-English explanation for every question. Free, no login.
Q1A truck operator reports a clunk noise when accelerating from a stop. Technician A says to inspect the U-joints for excessive wear. Technician B says to check for loose driveshaft yokes. Who is right?
✓ Correct answer: D. Both Technician A and B
Both technicians are correct. Worn U-joints can create clunking noises during acceleration as the slack in the worn joint is taken up. Similarly, loose driveshaft yokes will allow movement that results in a clunk sound when power is applied.
Q2When inspecting a driveshaft with two-piece construction, what component should be checked for bearing wear?
✓ Correct answer: C. Center support bearing
The center support bearing in a two-piece driveshaft supports the connection between the two driveshaft sections and is a common source of problems when worn.
Q3A truck has a vibration that increases with road speed. Technician A says an out-of-balance driveshaft could be the cause. Technician B says incorrect driveshaft phasing could be the cause. Who is right?
✓ Correct answer: B. Both Technician A and B
Both issues can cause vibration that increases with road speed. An out-of-balance driveshaft creates a rotating imbalance, while incorrect phasing between driveshaft sections creates a cyclical vibration.
Q4Which tool is most appropriate for checking universal joint wear?
✓ Correct answer: A. Dial indicator
A dial indicator is the most appropriate tool for accurately measuring the amount of movement (wear) in a universal joint by detecting small movements between the cross and cap assemblies.
Q5What is the most likely cause of a driveshaft vibration that occurs only at highway speeds under a load?
✓ Correct answer: D. Worn U-joints
Worn U-joints are most likely to cause vibration under load at highway speeds because the increased torque exaggerates the movement in the worn components as they rotate.
Q6When measuring driveline angles on a truck, what should be verified first?
✓ Correct answer: C. Vehicle ride height
Vehicle ride height must be verified first when measuring driveline angles because improper ride height will change all subsequent angle measurements and lead to incorrect analysis.
Q7Technician A says that excessive driveshaft angle can cause premature U-joint failure. Technician B says that a driveshaft should be installed with the slip yoke bottomed out in the transmission. Who is right?
✓ Correct answer: B. Technician A only
Technician A is correct - excessive driveline angles accelerate U-joint wear. Technician B is incorrect because the slip yoke should have proper clearance, not be bottomed out, to allow for suspension movement and prevent binding.
Q8When balancing a driveshaft, what should be done if the first weight placement does not correct the vibration?
✓ Correct answer: A. Add weight directly opposite to the first weight location
If the first weight doesn't correct vibration, weight should be added directly opposite the first weight location. This approach systematically addresses balance issues by testing effects of weight placement.
Q9What is the correct procedure for phasing a two-piece driveshaft during reassembly?
✓ Correct answer: D. Align the yokes at both ends of each section in the same plane
The yokes at both ends of each driveshaft section should be aligned in the same plane to ensure proper phasing, which prevents vibration caused by uneven rotational forces.
Q10A Class 8 truck has a shudder when accelerating from a stop. Technician A says to check for a loose flange at the rear of the transmission. Technician B says to check for worn slip splines in the driveshaft. Who is right?
✓ Correct answer: C. Both Technician A and B
Both technicians are correct. A loose transmission flange can cause shudder during acceleration, as can worn slip splines that allow excessive movement in the driveshaft assembly.
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Theory