ASE A3 Manual Drive Train and Axles

31. A manual transmission slips out of third gear. This is MOST likely caused by:

  • A. Worn bushings.
  • B. High fluid pressure.
  • C. A weak detent spring.
  • D. A worn shifter bushing.

31.

Answer A is wrong. Worn bearings make a growling noise that increases with speed.

Answer B is wrong. High fluid pressure can result in hard shifting in an automatic transmission.

Answer C is correct. A worn detent spring will result in a transmission slipping out of gear.

Answer D is wrong. A worn shifter bushing will result in a loose shifter.

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32. A rear-wheel-drive vehicle with a limited-slip differential chatters while turning. Technician A says that adding the wrong type of fluid results in this condition. Technician B says excessive pinion preload will cause this condition. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

32.

Answer A is correct. Limited slip differentials require special fluid.

Answer B is wrong. Both standard and limited-slip differentials must have proper pinion preload. Improper preload can result in a whining sound and premature bearing failure. Also, never back off a collapsible pinion spacer. This would cause too little preload. Check preload with an inch-pound torque wrench.

Answer C is wrong. Technician A is correct.

Answer D is wrong. Technician A is correct.

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33. Two technicians are discussing a vacuum-operated transfer case. Technician A says a vacuum of 10 "hg is required to operate this unit. Technician B says the vacuum motor operates a mode fork to switch between 2WD and 4WD. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

33.

Answer A is wrong. An average automotive engine produces between 17-21 "hg of vacuum. 10 "hg of vacuum is not enough to operate the motor of a vacuum-operated transfer case. There are different ways to control a transfer case; they can be manually, hydraulically, or electronically controlled.

Answer B is correct. There are different types of transfer cases. A vacuum-operated transfer case uses a mode fork to switch between 2WD and 4WD. An all-wheel drive vehicle contains a transfer case that remains in 4WD at all times.

Answer C is wrong. Technician B is correct.

Answer D is wrong. Technician B is correct.

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34. Which of the following can damage the drivetrain of a 4WD vehicle?

  • A. Driving a Part-Time 4WD vehicle in 4WD on dry pavement.
  • B. Different-sized tires.
  • C. Both A and B
  • D. Neither A or B

34.

Answer A is wrong. Both answers are correct.

Answer B is wrong. Both answers are correct.

Answer C is correct. Driving a Part-Time 4WD in 4WD on dry pavement can result in driveline damage. This is because the front tires rotate faster than the rest of the drivetrain. This causes drivetrain windup, also known as axle windup.

Answer D is wrong. All-wheel-drive vehicles must have the same size tires on all four wheels.

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35. Shift forks:

  • A. Are attached firmly to the shift rail.
  • B. Fit into the synchronizer sleeve.
  • C. Are attached firmly to the synchronizer sleeve.
  • D. Both A and B.

35.

Answer A is wrong. Shift forks are attached to the shift rail.

Answer B is wrong. They fit into a groove in the synchronizer sleeve.

Answer C is wrong. They slide into a groove in the synchronizer sleeve, allowing it to spin.

Answer D is correct. Both A and B are correct.

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