Question 1

Fixed-tripod-type CV joints are being discussed. Technician A says the fixed tripod joint cannot be removed from the drive shaft or disassembled because of the way it is manufactured. Technician B says the fixed tripod joint has less angular capability than a Rzeppa-type joint. Who is correct?

Accepted Answer

Technician A is correct. Fixed tripod joints typically cannot be disassembled and removed from the drive shaft because they are manufactured as a complete unit. Technician B is incorrect because fixed tripod joints actually have more angular capability than Rzeppa-type joints.

Question 2

Driveshaft speed variation is being discussed. Technician A says the speed variations at the transmission yoke end of the driveshaft are canceled out by the speed variations at the pinion flange end. Technician B says the operating angles at each end must be equal for the speed variations to cancel each other out. Who is correct?

Accepted Answer

Both technicians are correct. Speed variations at one end of the driveshaft can be canceled out by opposite speed variations at the other end, but the operating angles at each end must be equal for this to work properly.

Question 3

A popping or clicking noise when turning indicates a possible worn ______ CV joint.

Accepted Answer

A popping or clicking noise when turning is typically associated with a worn outer CV joint.

Question 4

Technician A says when the left-side axle shaft on an FWD vehicle is longer than the right side, torque steer is reduced. Technician B says the torsional damper on the axle shaft automatically balances the shaft. Who is correct?

Accepted Answer

The answer of Technician A says when the left-side axle...

Question 5

Before servicing the rear U-joint, slip joint, or center bearing on a two-piece drive shaft, ______.

Accepted Answer

Index marks are made to ensure the driveshaft is reassembled in the same orientation to maintain balance and alignment.

Question 6

Which type of joint is NOT a constant velocity type joint?

Accepted Answer

The answer of Which type of joint is NOT a...

Question 7

Technician A says the outer CV joints of FWD axle shafts are nine times more likely to need replacement than the inner joints. Technician B says a worn cage or race can cause a clicking sound during a turn. Who is correct?

Accepted Answer

Technician A is correct because outer CV joints are more exposed to stress and movement, making them more prone to wear. Technician B is correct because a worn cage or race in a CV joint can indeed cause a clicking sound during turns.

Question 8

A vehicle with a leaking extension housing seal is being diagnosed. Technician A says check for nicks and burrs on the driveshaft yoke. Technician B says a worn extension housing bushing could have caused the seal to fail. Who is correct?

Accepted Answer

Both technicians are correct. Nicks and burrs on the driveshaft yoke can cause damage to the seal and lead to leaks. A worn extension housing bushing can also cause the seal to fail as it can create excessive play and misalignment in the driveshaft, leading to seal damage.

Question 9

The bearing cups of a conventional U-joint are retained by ______.

Accepted Answer

All the methods mentioned (snap ring in the yoke, external snap ring in the bearing cup, and nylon injection) are used to retain bearing cups in U-joints, depending on the specific design and manufacturer.

Question 10

A humming or growling noise in the front of the vehicle that changes with road speed could be caused by ______.

Accepted Answer

A humming or growling noise that changes with road speed can be caused by any of the listed issues: inadequate lubrication of the inner CV joint, worn or damaged wheel bearings, or a bad intermediate shaft bearing.

Question 11

A FWD vehicle that makes a clunking noise when the automatic transmission is shifted into gear is being diagnosed. Technician A says the problem could be excessive play in an inner or outer CV joint. Technician B says the noise could be produced by excessive backlash in the differential gears and transmission. Who is correct?

Accepted Answer

Both technicians A and B are correct. Excessive play in an inner or outer CV joint can cause a clunking noise when the vehicle is shifted into gear. Additionally, excessive backlash in the differential gears and transmission can also produce a similar noise. Therefore, both technicians are correct in their diagnosis.

Question 12

Driveshafts are made of ______.

Accepted Answer

Driveshafts can be made from various materials including seamless steel tubing, reinforced fiberglass, and aluminum, depending on the application and design requirements.

Question 13

Axle shafts with CV joints at each end are found on the ______.

Accepted Answer

Axle shafts with CV joints are used in various vehicle configurations, including the front wheels of FWD cars, rear wheels of RWD cars with independent rear suspension, and front wheels of 4WD SUVs with independent front suspension.

Question 14

Technician A says axles with a numerically high gear ratio such as 4.11 allow the engine to run slower at any given speed, resulting in better fuel conservation. Technician B says axles with numerically low gear ratio such as 2.83 allow for fast acceleration and good pulling power. Who is correct?

Accepted Answer

Technician A is incorrect because a numerically high gear ratio like 4.11 results in higher engine RPMs at a given speed, not slower, which can decrease fuel efficiency. Technician B is incorrect because a numerically low gear ratio like 2.83 typically results in slower acceleration and less pulling power, not faster.

Question 15

A shudder or vibration only when accelerating is most likely caused by ______.

Accepted Answer

The answer of A shudder or vibration only when accelerating...

Question 16

Technician A says the differential allows torque to be transmitted to the driving axles at different speeds when the vehicle is turning a corner. Technician B says the gear ratio of the drive axle's ring and pinion gears provide a gear reduction and torque multiplication. Who is correct ?

Accepted Answer

Both technicians are correct. The differential allows for torque to be distributed to the drive wheels at different speeds when turning a corner, and the gear ratio of the drive axle's ring and pinion gears provides a gear reduction and torque multiplication.

Question 17

Technician A uses an impact wrench to tighten axle hub nuts. Technician B stakes the axle hub nuts after they are tightened to lock them in place. Who is correct?

Accepted Answer

Technician B is correct. Staking is the preferred method to lock axle hub nuts in place, not an impact wrench.

Question 18

If a noise is heard while driving straight ahead but it ceases on turns in the same direction, what is the most likely cause?

Accepted Answer

The answer of If a noise is heard while driving...

Question 19

If a drive axle shows signs of rubbing against the chassis, the vehicle should be checked for ______.

Accepted Answer

All the options provided could potentially cause the drive axle to rub against the chassis, so the vehicle should be checked for all these issues.

Question 20

CV joints are lubricated with ______.

Accepted Answer

CV joints require special high-temperature, high-pressure grease made specifically for them to ensure proper lubrication and protection under the demanding conditions they operate in.

Quiz 40: Drive Axles and Differentials