ASE A3 Manual Drive Train and Axles Practice Test

25 practice questions

Choose an answer, then check it under Show answer.

1. Question 1 of 25Medium

   An all-wheel-drive vehicle has a flashing AWD warning lamp during steady highway driving. Scan tool data displays a continuous wheel speed difference between the right-rear wheel and the other three wheels, but no electrical sensor faults are present. All four tires are the same brand, model, and nominal size. What should the technician check FIRST?

   1. AA. Right-rear hub bearing end play with a dial indicator
   2. BB. Cold tire inflation pressure on all four tires
   3. CC. Air gap between the right-rear sensor and tone ring
   4. DD. Transfer case fluid condition and clutch degradation
   Show answer to question 1

   Answer: B. Cold tire inflation pressure on all four tires

   A significantly underinflated tire has a reduced rolling radius and rotates faster than the other tires at highway speeds, prompting the AWD control module to detect a rotational mismatch. Checking tire inflation pressure is quick, non-intrusive, and addresses the most frequent cause before performing mechanical teardown or hub measurements.

2. Question 2 of 25Easy

   A technician is assembling a manual transmission countershaft gear assembly that uses loose needle bearings. Technician A says that petroleum jelly can be used to hold the loose needle bearings in place against the inner bore of the cluster gear during assembly. Technician B says that a dummy countershaft (pilot arbor) can be used to hold the needle bearings, spacers, and thrust washers in position while installing the cluster gear into the case. Who is correct?

   1. AA. A only
   2. BB. B only
   3. CC. Both A and B
   4. DD. Neither A nor B
   Show answer to question 2

   Answer: C. Both A and B

   Both technicians are correct. Petroleum jelly provides the tackiness needed to retain loose needle rollers during assembly and dissolves harmlessly in transmission gear oil once the unit is in service. A dummy countershaft, machined slightly shorter than the inside width of the case, holds the rollers, thrust washers, and spacers in alignment within the cluster gear until the permanent countershaft is driven through.

3. Question 3 of 25Medium

   A technician is installing a new center support bearing and bracket on a two-piece driveshaft. All of the following are correct EXCEPT:

   1. AA. The bracket should be free of cracks and its mounting holes undistorted
   2. BB. The bracket preload direction specified by the manufacturer must be followed
   3. CC. The bracket bolts may be left loose so the bearing self-centers in service
   4. DD. The bracket must be installed so the shaft returns to its original alignment
   Show answer to question 3

   Answer: C. The bracket bolts may be left loose so the bearing self-centers in service

   The bracket bolts must be torqued to specification with the assembly positioned and preloaded as the manufacturer directs; leaving them loose allows the shaft to move and the bearing to be damaged. The bracket must also be sound and the shaft returned to its original alignment to keep driveline angles correct.

4. Question 4 of 25Easy

   A front-wheel-drive vehicle needs a broken engine mount replaced. Technician A says the powertrain does not need to be supported when only one mount is removed. Technician B says the powertrain should be supported before the mount is removed so it does not drop or stress the remaining mounts and hoses. Who is correct?

   1. AA. A only
   2. BB. B only
   3. CC. Both A and B
   4. DD. Neither A nor B
   Show answer to question 4

   Answer: B. B only

   Even with only one mount removed, the powertrain can drop or shift and load the remaining mounts, hoses, and wiring, so the first technician is wrong. Supporting the powertrain before removing the mount is the correct procedure, so the second technician is right.

5. Question 5 of 25Easy

   A customer reports that the floor-mounted transfer case shift lever has excessive side-to-side looseness, but it still engages all ranges normally. Which is the MOST likely cause?

   1. AA. Worn shift lever pivot bushing
   2. BB. Broken transfer case mount
   3. CC. Low transfer case lubricant
   4. DD. Worn shift fork pads
   Show answer to question 5

   Answer: A. Worn shift lever pivot bushing

   Side-to-side looseness at the lever with normal range engagement is typical of a worn pivot bushing. A broken mount would move the entire transfer case and lever together, and fork pads or lubricant affect internal engagement, not lever free play.

6. Question 6 of 25Easy

   A technician is measuring drive shaft runout with a dial indicator. Where should the magnetic base of the indicator be attached?

   1. AA. To the frame or axle housing
   2. BB. To the transmission output shaft
   3. CC. To the drive shaft tube near the center
   4. DD. To the pinion flange
   Show answer to question 6

   Answer: A. To the frame or axle housing

   The indicator base must be mounted to a rigid, stationary component so the gauge reads shaft movement relative to the vehicle. Mounting the base to the shaft or to a rotating component would cancel or add movement and give a false reading.

7. Question 7 of 25Easy

   A rear-wheel-drive vehicle exhibits a pronounced chatter and shudder from the rear axle when making tight turns in a parking lot. The customer states that the rear axle fluid was changed last week. Which of these is the MOST likely cause?

   1. AA. Excessive ring gear-to-pinion backlash
   2. BB. Bent rear drive axle shaft
   3. CC. Worn differential carrier bearings
   4. DD. Missing friction modifier additive in the gear lubricant
   Show answer to question 7

   Answer: D. Missing friction modifier additive in the gear lubricant

   A clutch-type limited slip differential requires a specific friction modifier additive to prevent the clutch plates from alternately sticking and slipping during cornering. Omitting this additive during a fluid service causes severe clutch chatter during turns. Excessive ring gear backlash would cause driveline clunk on acceleration or deceleration, not chatter isolated to turns.

8. Question 8 of 25Medium

   A manual transaxle leaks fluid at a half-shaft seal. The seal is replaced, but the leak returns within a week. Which should the technician check NEXT?

   1. AA. The clutch release bearing for wear.
   2. BB. The transaxle vent for a restriction.
   3. CC. The shift linkage for free play.
   4. DD. The speedometer gear for backlash.
   Show answer to question 8

   Answer: B. The transaxle vent for a restriction.

   A restricted transaxle vent can pressurize the case and force fluid past a new seal, so the vent should be checked before replacing the seal again. Clutch, linkage, and speedometer gear problems do not create case pressure.

9. Question 9 of 25Medium

   After a clutch master cylinder replacement, the clutch slips after several miles of driving. The technician finds the pushrod adjusted too long, leaving less pedal free play than specified. Which is the MOST likely result of this condition?

   1. AA. The delay valve opens too soon during engagement
   2. BB. The release bearing retracts too far from the pressure plate
   3. CC. Air is drawn in through the compensation port
   4. DD. The compensation port stays closed and pressure is trapped
   Show answer to question 9

   Answer: D. The compensation port stays closed and pressure is trapped

   Pedal free play allows the master cylinder piston to uncover the compensation port so pressure can return to the reservoir. With too little free play, the port stays closed, pressure builds in the release circuit, and the clutch can slip. Too much free play would cause insufficient release rather than slip.

10. Question 10 of 25Hard

    A technician mounts a new final drive ring gear to a transaxle differential carrier and checks lateral runout with a dial indicator. The runout reading exceeds the maximum allowable limit. What should the technician do next?

    1. AA. Remove the ring gear and measure runout of the carrier mounting flange
    2. BB. Install selective shims between the ring gear and carrier flange
    3. CC. Tap the ring gear rim with a brass drift until runout is eliminated
    4. DD. Machine the ring gear mounting face on a precision surface grinder
    Show answer to question 10

    Answer: A. Remove the ring gear and measure runout of the carrier mounting flange

    If ring gear runout is excessive, the technician should remove the gear and inspect the carrier flange for burrs, dirt, or warpage by measuring carrier flange runout directly. Shimming between the ring gear and carrier is not an approved repair, and machining or hammering hardened gear faces is strictly prohibited.

11. Question 11 of 25Easy

    During the disassembly of a manual transaxle differential, a technician finds severe galling and heat discoloration on the differential pinion shaft and the bores of the differential pinion gears. The transaxle fluid was at the proper level and uncontaminated. Which of the following is the MOST likely cause of this damage?

    1. AA. Prolonged vehicle operation with one drive wheel spinning on a slippery surface
    2. BB. Excessive ring gear-to-output shaft gear backlash
    3. CC. Incorrect differential carrier bearing preload shim selection
    4. DD. Operating the vehicle with slightly uneven front tire pressures
    Show answer to question 11

    Answer: A. Prolonged vehicle operation with one drive wheel spinning on a slippery surface

    When one drive wheel spins freely while the opposite wheel has traction (such as being stuck in snow or mud), the differential pinion gears spin at extremely high rotational speeds on the pinion shaft, causing severe friction, overheating, and galling. Incorrect carrier bearing preload would cause bearing wear or whining noises rather than pinion shaft galling.

12. Question 12 of 25Medium

    Two technicians are discussing the reassembly of a manual transaxle gear train. Technician A says that synchronizer sleeves and hubs often have alignment marks that must be aligned during assembly. Technician B says that needle roller bearings supporting the free-wheeling speed gears should be lubricated with clean transaxle fluid during assembly. Who is correct?

    1. AA. A only
    2. BB. B only
    3. CC. Both A and B
    4. DD. Neither A nor B
    Show answer to question 12

    Answer: C. Both A and B

    Both technicians are correct. Technician A is correct because synchronizer hubs and sliding sleeves are frequently machined as matched pairs and have alignment marks or asymmetric splines that ensure correct orientation, proper key clearance, and correct oil channel alignment. Technician B is correct because all needle roller bearings, shaft journals, and thrust surfaces must be coated with clean, specified manual transaxle lubricant during reassembly to prevent metal-to-metal contact and scuffing during initial startup.

13. Question 13 of 25Medium

    Technician A says a worn pilot bearing typically makes a squealing noise when the clutch pedal is released and the transmission is in neutral. Technician B says a worn pilot bearing can allow input shaft misalignment and cause clutch chatter. Who is correct?

    1. AA. A only
    2. BB. B only
    3. CC. Both A and B
    4. DD. Neither A nor B
    Show answer to question 13

    Answer: B. B only

    Technician B is correct because a worn pilot bearing or bushing allows the front of the input shaft to move, which misaligns the clutch disc and can cause chatter. Technician A is wrong because when the clutch is engaged, the input shaft turns with the crankshaft, so the pilot bearing has little or no relative motion and does not typically squeal in neutral.

14. Question 14 of 25Medium

    A front-wheel-drive vehicle has a shudder during acceleration from a stop, and the vibration goes away when the vehicle coasts. Both outer CV boots are intact, the wheel bearings have no play, and the tires are balanced. Which of these is the MOST likely cause?

    1. AA. A warped brake rotor
    2. BB. A worn outer CV joint
    3. CC. A worn inner CV joint
    4. DD. A bent wheel
    Show answer to question 14

    Answer: C. A worn inner CV joint

    Inner CV joint wear can cause a shudder under acceleration that disappears when torque is removed and the vehicle coasts. Outer CV joint wear usually clicks during turns, while a bent wheel or warped brake rotor would not produce a shudder that specifically disappears on coast.

15. Question 15 of 25Easy

    While inspecting a disassembled open differential assembly, all of the following conditions indicate a need to replace components EXCEPT:

    1. AA. Backlash between the side gear and spider gear teeth that is within manufacturer specification
    2. BB. Grooves and heat discoloration on the differential pinion shaft
    3. CC. Galling and metal transfer on the thrust washer seating surfaces of the differential case
    4. DD. Pitted and chipped gear teeth on the differential side gears
    Show answer to question 15

    Answer: A. Backlash between the side gear and spider gear teeth that is within manufacturer specification

    Measurable backlash between the side gears and pinion (spider) gears within manufacturer specification is normal and required to provide running clearance and adequate lubrication. Heat discoloration on the shaft, galling on the differential case thrust faces, and chipped gear teeth all represent severe mechanical damage requiring part replacement.

16. Question 16 of 25Medium

    A technician needs to correct improper drive shaft working angles on a rear-wheel-drive vehicle. All of the following are acceptable methods to alter these angles EXCEPT:

    1. AA. Adding or removing shims underneath the transmission extension housing mount
    2. BB. Adjusting the length of threaded upper or lower rear suspension control arms
    3. CC. Machining material from the universal joint trunnions to offset the cross inside the yoke
    4. DD. Installing angled wedge shims between the rear leaf springs and the axle spring perches
    Show answer to question 16

    Answer: C. Machining material from the universal joint trunnions to offset the cross inside the yoke

    Universal joint crosses must never be machined or modified, as altering trunnion dimensions ruins bearing fit, destroys case-hardening, and causes catastrophic joint failure. Driveline working angles are properly corrected by repositioning the powertrain or axle housing. Common approved adjustments include shimming the transmission mount, using pinion angle shims at leaf spring pads, or adjusting rear control arms.

17. Question 17 of 25Medium

    With the ring gear removed, a dial indicator on the differential case flange shows runout greater than the manufacturer's specification. What should the technician do?

    1. AA. Reduce side bearing preload and recheck
    2. BB. Replace the differential case
    3. CC. Replace the pinion gear and set backlash
    4. DD. Reindex the ring gear and recheck runout
    Show answer to question 17

    Answer: B. Replace the differential case

    The case flange is the mounting surface for the ring gear, so runout there that exceeds specification means the case is distorted or damaged and must be replaced. Reindexing the ring gear cannot correct runout built into the case flange itself.

18. Question 18 of 25Medium

    All of the following are likely causes of a speed-related whine from a transfer case EXCEPT:

    1. AA. Worn transfer case bearings
    2. BB. A loose shift linkage
    3. CC. Low transfer case fluid level
    4. DD. Worn transfer case gears
    Show answer to question 18

    Answer: B. A loose shift linkage

    A loose shift linkage may rattle or feel loose, but it does not cause a speed-related gear whine. Worn bearings, worn gears and a low fluid level are all common sources of transfer case whine that changes with vehicle speed.

19. Question 19 of 25Medium

    A vehicle with an automated manual transaxle has no communication with the transmission control module. The scan tool communicates normally with the engine control module and other modules on the same network. What should the technician check FIRST?

    1. AA. The transmission control module powers and grounds
    2. BB. The resistance between the network CAN high and CAN low terminals
    3. CC. The transmission vehicle speed sensor signal
    4. DD. The scan tool software version
    Show answer to question 19

    Answer: A. The transmission control module powers and grounds

    When one module does not communicate but others on the same network do, the isolated module's power and ground supplies should be verified first. Network resistance or sensor signals are not the first check because the rest of the network is communicating normally. The scan tool is already communicating with other modules, so its software is not the most likely issue.

20. Question 20 of 25Hard

    A technician is adjusting a differential and is discussing the purpose of the adjustments. Technician A says ring and pinion backlash is adjusted by changing the thickness of the pinion depth shim. Technician B says side bearing preload is adjusted by changing the ring gear backlash. Who is correct?

    1. AA. A only
    2. BB. B only
    3. CC. Both A and B
    4. DD. Neither A nor B
    Show answer to question 20

    Answer: D. Neither A nor B

    Pinion depth shims set pinion depth and contact pattern, not ring and pinion backlash; backlash is adjusted by moving the carrier or changing side shims or adjusters. Side bearing preload is set by shim thickness or adjuster torque, not by ring gear backlash. Therefore neither technician is correct.

21. Question 21 of 25Hard

    A manual transaxle jumps out of reverse under load. The reverse idler gear, thrust washers, and snap ring are within specification, but the idler shaft is loose in the transaxle case. What should the technician do?

    1. AA. Replace the reverse idler gear and recheck operation.
    2. BB. Adjust the shift linkage for greater engagement.
    3. CC. Install a thicker thrust washer to remove looseness.
    4. DD. Repair or replace the case or shaft for a secure fit.
    Show answer to question 21

    Answer: D. Repair or replace the case or shaft for a secure fit.

    A reverse idler shaft that is loose in the case allows the idler gear to misalign and can cause the transaxle to jump out of reverse under load, so the shaft-to-case fit must be restored. A thicker thrust washer changes endplay only, and linkage adjustment will not correct a loose shaft.

22. Question 22 of 25Hard

    Two technicians are reassembling the shift mechanism and drive components in a manual-shift transfer case. Technician A says that worn plastic inserts on the shift fork fingers should be replaced to prevent shifting issues. Technician B says that the drive chain and both sprockets should typically be engaged together and installed onto their shafts simultaneously. Who is correct?

    1. AA. A only
    2. BB. B only
    3. CC. Both A and B
    4. DD. Neither A nor B
    Show answer to question 22

    Answer: C. Both A and B

    Technician A is correct because worn or missing shift fork inserts cause excessive clearance between the fork and the synchronizer sleeve, which can lead to incomplete engagement or popping out of gear. Technician B is correct because continuous transfer case drive chains have no master link and lack sufficient slack to be installed over sprockets that are already seated on their shafts.

23. Question 23 of 25Hard

    A drive axle is being assembled with new drive pinion bearings. Technician A says new pinion bearings require a lower rotating torque preload specification than reused bearings. Technician B says a properly preloaded pinion shaft will exhibit slight axial end play when measured with a dial indicator. Who is correct?

    1. AA. A only
    2. BB. B only
    3. CC. Both A and B
    4. DD. Neither A nor B
    Show answer to question 23

    Answer: D. Neither A nor B

    Technician A is wrong because new bearings have a higher preload rotating torque specification than used bearings to allow for initial wear-in and seating. Technician B is wrong because bearing preload applies a continuous compressive load that eliminates clearance, meaning there must be zero end play on a correctly preloaded pinion shaft.

24. Question 24 of 25Hard

    During teardown of a manual transaxle, a technician finds that one differential bearing cup has spun in its aluminum case bore, leaving polished chatter marks, while the bearing rollers and cups show only normal wear. Which is the MOST likely cause?

    1. AA. A worn differential pinion shaft
    2. BB. Excessive bearing preload from a shim that was too thick
    3. CC. Excessive ring gear backlash
    4. DD. Insufficient bearing preload from a shim that was too thin
    Show answer to question 24

    Answer: D. Insufficient bearing preload from a shim that was too thin

    Without enough preload the cup is not clamped firmly in the case bore, so it creeps and frets against the aluminum, producing the chatter marks and spin. Excessive preload would instead overheat the bearing and show blued, scored rollers and cups rather than a spun outer cup.

25. Question 25 of 25Hard

    A transaxle shift cover binds when it is torqued to the case, and the shift rails move freely when the cover bolts are loosened. Which of these is the MOST likely cause?

    1. AA. Worn or loose shift fork pads
    2. BB. A warped cover or worn shift rail bores
    3. CC. A stretched or misrouted shift cable
    4. DD. Weak or mismatched detent springs
    Show answer to question 25

    Answer: B. A warped cover or worn shift rail bores

    If the rails free up as soon as the cover bolts are loosened, the binding comes from the cover or its bores, which misalign the rails when clamped down. Weak detent springs would make shifting too light rather than bind, and fork pad wear or a cable problem would not change with cover bolt torque.

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