ASE T5 LATEST 2026 END OF COURSE QUESTIONS AND
SOLUTIONS GUARANTEE A+
✔✔32. A universal joint has failed prematurely. The failure was so drastic that the bars
on the cross are cracked almost all the way through. The MOST likely cause is
A. improper lubrication maintenance
B. overtorqued U-bolt retaining nuts
C. too much load carried over a long period of time
D. contamination of lube due to deteriorated seals, which in turn causes binding -
✔✔32. The correct answer is C. Although all the other causes could overstrain the
crosses, the bulk of the damage would tend to occur to the bearings, cross bearing
surfaces and cups.
✔✔33. A driveshaft exhibits vibration. A road test reveals that the vibration ONLY
occurs at certain speeds under normal loads, not all the way up and down the truck's
speed range, and not under heavy load. The MOST likely cause is:
A. driveshaft too heavy for the engine-transmission
mounting system
B. improper phasing
C. the driveshaft is bent or inadequately balanced
D. one or both of the U-joints is excessively worn - ✔✔33. The correct answer is B.
Improper phasing tends to provide vibration at a different frequency from the other
problems. The type of vibration it produces causes the truck chassis to pass the
vibration onto the cab only when the frequency is right. So vibration will be noticed only
at certain speeds. Also, moderate torque loads can enable the driveshaft tubes to
absorb and dampen the slight vibration
✔✔34. Which of the following problems is the LEAST likely cause of a differential being
noisy only on turns?
A. worn differential side gears and pinions
B. won differential spider
C. worn differential thrust washers
D. a bent axle shaft - ✔✔34. The correct answer is D. A bent axle shaft would be
rotating and vibrating at almost the same speed or frequency whether the truck was
rounding a corner or not.
✔✔35. Technician A says the outboard planetary axle has a separate oil supply.
Technician B says the inboard planetary axle is used on most trucks. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ✔✔35. The correct answer is A. Outboard planetary axles need a
separate oil supply to lubricate the additional gears at each wheel. The most common
planetary drive axle found in trucks is the outboard, not the inboard planetary type.
, ✔✔36. What is the purpose of changing the rear axle lubricant shortly after overhaul?
A to thicken the viscosity
B. to remove metal created during break-in
C. to allow for proper bearing seating
D. to take an oil sample - ✔✔36. The correct answer is B. Manufacturers recommend
changing the rear axle lubricant a short period after over haul. This will remove the high
levels of metal created during the break-in of the new parts.
✔✔37. Technician A says the PTO is designed to power accessories such as a dump
body. Technician B says the transfer case redirects power to the front axle. Who is
right?
A. Technician A only
Technician B only
C. Both A and B
D. Neither A or B - ✔✔37. The correct answer is C, both technicians are right. The PTO
is designed to power accessories through the transmission while the transmission is in
neutral. It is an extension of the drivetrain that allows power to be mechanically
transferred to the accessory via a separate driveshaft or pump. The transfer case is
basically a transmission unit mounted into the driveline, where, by using gearing
arrangements, engine power can be redirected. This engine power change of direction
is normally used to supply power to a differential unit on the front axle for front-wheel
drive.
✔✔38. Drive gears and pinions are tested and marked at the time of manufacture. This
procedure is performed to:
A. obtain gear teeth angles
B. show the correct part number listing
C. show where tooth contact is quietest
D. designate the specific rear axle for their use - ✔✔38. The correct answer is C. Drive
gears and pinions are tested at the time of manufacture to detect machining variances
and to obtain desirable tooth contact and quietness. When the correct setting is
achieved, the gears are considered matched and a set of numbers, along with other
identifying marks, are etched on the gear set.
✔✔39. A differential has been disassembled and crescent-shaped marks running along
the length of the gear tooth have been found on some of the gears. Technician A says
these marks indicate a lack of lubrication. Technician B says these are beach marks
and are an indication of shock load. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ✔✔39. The correct answer is B. A crescent shaped mark that runs
along the length of the gear tooth is called a beach mark and is an indication of a shock
load. The tooth will actually bend at these marks, eventually causing breakage. Gears
that have suffered lack of lubrication will show pitting or scoring.
SOLUTIONS GUARANTEE A+
✔✔32. A universal joint has failed prematurely. The failure was so drastic that the bars
on the cross are cracked almost all the way through. The MOST likely cause is
A. improper lubrication maintenance
B. overtorqued U-bolt retaining nuts
C. too much load carried over a long period of time
D. contamination of lube due to deteriorated seals, which in turn causes binding -
✔✔32. The correct answer is C. Although all the other causes could overstrain the
crosses, the bulk of the damage would tend to occur to the bearings, cross bearing
surfaces and cups.
✔✔33. A driveshaft exhibits vibration. A road test reveals that the vibration ONLY
occurs at certain speeds under normal loads, not all the way up and down the truck's
speed range, and not under heavy load. The MOST likely cause is:
A. driveshaft too heavy for the engine-transmission
mounting system
B. improper phasing
C. the driveshaft is bent or inadequately balanced
D. one or both of the U-joints is excessively worn - ✔✔33. The correct answer is B.
Improper phasing tends to provide vibration at a different frequency from the other
problems. The type of vibration it produces causes the truck chassis to pass the
vibration onto the cab only when the frequency is right. So vibration will be noticed only
at certain speeds. Also, moderate torque loads can enable the driveshaft tubes to
absorb and dampen the slight vibration
✔✔34. Which of the following problems is the LEAST likely cause of a differential being
noisy only on turns?
A. worn differential side gears and pinions
B. won differential spider
C. worn differential thrust washers
D. a bent axle shaft - ✔✔34. The correct answer is D. A bent axle shaft would be
rotating and vibrating at almost the same speed or frequency whether the truck was
rounding a corner or not.
✔✔35. Technician A says the outboard planetary axle has a separate oil supply.
Technician B says the inboard planetary axle is used on most trucks. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ✔✔35. The correct answer is A. Outboard planetary axles need a
separate oil supply to lubricate the additional gears at each wheel. The most common
planetary drive axle found in trucks is the outboard, not the inboard planetary type.
, ✔✔36. What is the purpose of changing the rear axle lubricant shortly after overhaul?
A to thicken the viscosity
B. to remove metal created during break-in
C. to allow for proper bearing seating
D. to take an oil sample - ✔✔36. The correct answer is B. Manufacturers recommend
changing the rear axle lubricant a short period after over haul. This will remove the high
levels of metal created during the break-in of the new parts.
✔✔37. Technician A says the PTO is designed to power accessories such as a dump
body. Technician B says the transfer case redirects power to the front axle. Who is
right?
A. Technician A only
Technician B only
C. Both A and B
D. Neither A or B - ✔✔37. The correct answer is C, both technicians are right. The PTO
is designed to power accessories through the transmission while the transmission is in
neutral. It is an extension of the drivetrain that allows power to be mechanically
transferred to the accessory via a separate driveshaft or pump. The transfer case is
basically a transmission unit mounted into the driveline, where, by using gearing
arrangements, engine power can be redirected. This engine power change of direction
is normally used to supply power to a differential unit on the front axle for front-wheel
drive.
✔✔38. Drive gears and pinions are tested and marked at the time of manufacture. This
procedure is performed to:
A. obtain gear teeth angles
B. show the correct part number listing
C. show where tooth contact is quietest
D. designate the specific rear axle for their use - ✔✔38. The correct answer is C. Drive
gears and pinions are tested at the time of manufacture to detect machining variances
and to obtain desirable tooth contact and quietness. When the correct setting is
achieved, the gears are considered matched and a set of numbers, along with other
identifying marks, are etched on the gear set.
✔✔39. A differential has been disassembled and crescent-shaped marks running along
the length of the gear tooth have been found on some of the gears. Technician A says
these marks indicate a lack of lubrication. Technician B says these are beach marks
and are an indication of shock load. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ✔✔39. The correct answer is B. A crescent shaped mark that runs
along the length of the gear tooth is called a beach mark and is an indication of a shock
load. The tooth will actually bend at these marks, eventually causing breakage. Gears
that have suffered lack of lubrication will show pitting or scoring.
