ASE A3 Manual Drive Train and Axles

1. 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.

1.

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.

2. A rear wheel drive vehicle with a limited slip differential chatters during turns. Technician A says that adding the wrong type of fluid results in this condition. Technician B says excessive pinion preload will cause this differential to chatter around corners. Who is correct?

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

2.

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 a whining sound and premature bearing failure. Also never back off a pinion collapsible spacer, this would cause too little preload. Check preload with an inch torque wrench.

Answer C is wrong. Technician A is correct.

Answer D is wrong. Technician A is correct.

3. Two technicians are discussing a vacuum operated transfer case. Technician A says a vacuum between 10 "hg and 18 "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

3.

Answer A is wrong. It takes at least 15 "hg of vacuum 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 the remains in 4WD at all times.

Answer C is wrong. Technician B is correct.

Answer D is wrong. Technician B is correct.

4. Which of the following can result in damage to drivetrain of a 4WD vehicle?

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

4.

Answer A is wrong. Only because both answers are correct.

Answer B is wrong. Both answers are correct.

Answer C is correct. Driving a Part Time 4WD vehicle on dry pavement results in driveline damage. This is because the front tires are rotating faster than the rest of the drivetrain. This causes drivetrain windup also known as axle windup.

Answer D is wrong. AWD All Wheel Drive vehicles must have the same size tires on all four wheels.

5. Two technicians are discussing a clutch master assembly. Technician A says external leaks are due to the secondary seal. Technician B says hydraulic fluid is hygroscopic and tends to absorb moisture from the atmosphere. Who is correct?

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

5.

Answer A is wrong. The primary seal leaks internally and the secondary seal leaks externally. A leaking secondary seal will result in fluid dripping from the clutch master on to the driver's floor panel.

Answer B is wrong. Brake fluid is typically used. Brake fluid is hygroscopic and easily absorbs moisture. Always remember to replace the cap on the brake fluid before putting it back into storage.

Answer C is correct. Both technicians are correct.

Answer D is wrong. Both technicians are correct.