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ASE Automobile & Light Truck (A1–A8) — Practice Exam

A3 Driveshafts: practice questions

Our ASE A1–A8 bank has 5 questions on this topic. Here are 4 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1 · A3 Manual Drive Train & Axles

What should be done before removing a driveshaft?

  1. Drain the engine oil
  2. Remove the wheels
  3. Disconnect the battery and set the parking brake firmly
  4. Mark it so it can be reinstalled in the same position
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D. Mark it so it can be reinstalled in the same position — Reinstalling in the same position preserves balance.

Question 2 · A3 Manual Drive Train & Axles

What does a center support bearing do on a two-piece driveshaft?

  1. Supports the shaft between sections and absorbs vibration
  2. Sets pinion bearing preload for the rear axle assembly
  3. Locks the differential
  4. Drives the speedometer
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A. Supports the shaft between sections and absorbs vibration — A worn center bearing can cause vibration or noise.

Question 3 · A3 Manual Drive Train & Axles

A vibration that increases with road speed in a RWD vehicle may come from what?

  1. An unbalanced or out-of-phase driveshaft, or worn U-joints
  2. A worn steering rack and tie rod ends on the front axle
  3. A worn clutch disc
  4. A loose spark plug
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A. An unbalanced or out-of-phase driveshaft, or worn U-joints — Driveshaft vibration follows vehicle speed, not engine speed.

Question 4 · A3 Manual Drive Train & Axles

Why must U-joint yokes be in phase on a two-joint driveshaft?

  1. To lubricate the joints
  2. To shorten the shaft
  3. To allow more operating angle at the rear axle pinion
  4. So the speed variations of the two joints cancel out
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D. So the speed variations of the two joints cancel out — Out-of-phase yokes cause vibration.

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