Deck 7: Differentials and Drive Axles

Question 1

A differential is needed between any two drive wheels, whether in a RWD, FWD, all-wheel drive (AWD), pr four-wheel drive (4WD).

Answer 1

True

Question 2

In a ring gear and pinion gear set, the pinion is the larger drive gear and the ring gear is the smaller driven gear.

Answer 2

False

Question 3

When engines are placed longitudinally in the car, they are said to have "north/south" placement.

Answer 3

True

Question 4

Technician A says, upon heavy acceleration, the pinion attempts to climb up the ring gear due to an "equal and opposite" reaction. Technician B says this action attempts to raise the front of the differential housing. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 5

Some limited-slip differentials are gear-based (no internal clutches) units that transfer torque from a slipping wheel to the wheel with more traction.

Question 6

Technician A says the hypoid gearset was designed to lower the body profile. Technician B says hypoid gears provide for smoother and quieter action. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 7

The differential case is mounted on _____ so that it is able to rotate independently of the drive axles.

A) shafts
B) gears
C) bearings
D) pinions

Question 8

A _____ gearset is one in which any one pinion tooth comes into contact with only some of the ring gear teeth, but more that one revolution of the ring gear is required to achieve all possible gear tooth contact combinations.

A) hunting
B) nonhunting
C) partial nonhunting
D) hypoid

Question 9

The _____ is the final set of reduction gears the engine's power passes through on its way to the drive wheels.

A) final fear
B) final drive
C) drive shaft
D) driveline

Question 10

Preload in bearings eliminates _____.

A) torque
B) pressure
C) breakage
D) looseness

Question 11

_____ express the number of turns the drive gear makes compared to one turn of the driven gear it mates with.

A) Rotations
B) Gear ratios
C) Circulations
D) Combinations

Question 12

The main types of _____ are torque sensitive, speed sensitive, or mechanically locked.

A) limited-slip differentials
B) locked differentials
C) gear sets
D) clutch packs

Question 13

At least four bearings are found in all differentials: one over the drive pinion shaft with the other three supporting the differential case.

Question 14

RWD final drives normally use a hypoid ring and pinion gearset that turns the power-flow 45 degrees from the drive shaft to the drive axles.

Question 15

The teeth of a hypoid gear are _____, causing a wiping action when meshing.

A) circular
B) straight in a line
C) curved to follow a spiral
D) elliptical

Question 16

The overhung-mounted pinion has three bearings supporting the pinion.

Question 17

To replace a ring and pinion gearset with one of the correct ratio, the ratio of the original set must be known.

Question 18

A _____ gearset is one in which any one pinion tooth comes into contact with only some of the ring gear teeth. One revolution of the ring gear is required to achieve all possible gear tooth contact combinations.

A) hunting
B) nonhunting
C) partial nonhunting
D) hypoid

Question 19

Backlash is the clearance or play between two gears in a mesh.

Question 20

Lapping is the process of using a grinding paste to produce a fine finish on the teeth of the two gears that will be in full contact with each other

Question 21

What is meant by the term axle ratio?

Question 22

Name the basic differential components indicated by arrows in the figure below.

Question 23

Distinguish between an integral carrier housing and a removable carrier housing.

Question 24

What type of gearset allows the drive shaft to be positioned low in the vehicle because the final drive pinion gear centerline is below the ring gear centerline?

Question 25

Geared, torque-sensitive mechanical limited-slip differentials use _____ gears which react to an increase or decrease in torque at one of two shafts.

A) hypoid
B) limited-slip
C) helical
D) worm

Question 26

What is the metal unit encasing the differential side gears and pinion gears to which the ring gear is attached?

Question 27

What is a differential?

Question 28

How is the final drive ratio determined?

Question 29

Based on the information provided in the differential figure below, does the action indicate the vehicle is turning a corner or moving straight?

Question 30

What part is used to prevent the lubricant from leaking out of the housing of a straight roller axle bearing?

A) oil seal
B) grease seal
C) rubber seal
D) flange

Question 31

What is bolted to the axle and contains all of the information needed to identify the axle for diagnosis and service?

Question 32

What is the difference between a live axle and a dead axle?

Question 33

Where is the final drive located in RWD and FWD cars?

Question 34

Technician A says that there are three designs of axle shaft bearings: ball-type, straight roller, and C-type roller bearings. Technician B says that the three designs are: ball-type, straight roller, and tapered roller bearings.Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 35

_____ is a suspension alignment term used to define the amount of centerline of a wheel is tilted inward or outward from the true vertical plane of the wheel.

A) Floating
B) Slipping
C) Tapering
D) Camber

Question 36

What are some factors considered when a manufacturer selects a final drive ratio for a vehicle?

Question 37

The bearing of a _____ is located on the outside of the housing which places all of the vehicle's weight on the axle housing with no weight on the axle.

A) full-floating rear axle
B) three-quarter floating rear axle
C) semifloating rear axle
D) dead axle

Question 38

Based on their construction, axle housings can be divided into what two groups?

Question 39

What are the three types of ring and pinion gear sets?

Question 40

What is "one wheel peel?"