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12-61

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

In a differential, the ____ gear turns the ring gear when the drive shaft is rotating.
a.
pinion
c.
spur
b.
hunting
d.
rack
 

 2. 

Hypoid gears have replaced spiral bevel gears in differentials because ____.
a.
they are quieter
c.
they can rotate at higher speeds
b.
they are significantly lighter
d.
All of the above.
 

True/False
Indicate whether the statement is true or false.
 

 3. 

Higher rear axle ratios tend to improve fuel economy.
 

 4. 

Ring and pinion gears used in differentials are commonly a matched set.
 

 5. 

When a car is turning, the rear wheels must turn at different speeds.
 

 6. 

A limited slip differential is designed to improve traction on slippery pavement or snow.
 

 7. 

A semifloating axle is usually found only on high-performance vehicles.
 

Matching
 
 
Identify each of the marked items on the diagram below.
grp001-1.jpg
 

 8. 

Preload diaphragm spring.
 

 9. 

Shim.
 

 10. 

Case.
 

 11. 

Fixed steel plate.
 

 12. 

Case side bearing.
 

 13. 

Side gear splines.
 

 14. 

Pinion shaft bolt.
 

 15. 

Pinion gear.
 

 16. 

Ring gear.
 

 17. 

Pinion shaft.
 

 18. 

Splined friction disc.
 

 19. 

Thrust washer.
 

Completion
Complete each statement.
 

 20. 

Axle ______________________________ are often used to limit end play.
 

 

 21. 

The ______________________________ axle is the most common type found on automobiles.
 

 

 22. 

On a four-wheel drive vehicle, ______________________________ hubs are used to transfer power from driving axles to driving wheels.
 

 

 23. 

When the differential is mounted solidly on the car’s frame, ______________________________ axles are used.
 

 

 24. 

In most differentials, an SAE 80W-90 ______________________________ oil is used for lubrication.
 

 

 25. 

On a turning vehicle, the outside wheel must turn ______________________________ than the inside wheel.
 

 



 
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