Deck 7: Differentials and Drive Axles Servicing 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

Preload in bearings eliminates _____.

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

Answer 2

D

Question 3

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

Answer 3

False

Question 4

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 5

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 6

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

Question 7

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 8

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

Question 9

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

Question 10

_____ 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 11

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 12

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 13

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 14

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

Question 15

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 16

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 17

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 18

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

Question 19

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 20

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 21

What is meant by the term axle ratio?

Question 22

What is a differential?

Question 23

_____ 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 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

What is "one wheel peel?"

Question 26

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

Question 27

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 28

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

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

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

Question 31

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

Question 32

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

Question 33

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 34

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

Question 35

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

Question 36

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

Question 37

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

Question 38

How is the final drive ratio determined?