drivetrains EOC

Name the following rear axle gear sets: 1: 3.00:1 2: 3.50:1 3: 4.11:1

1: Non hunting 2: Partial non hunting 3: Hunting

Name the following three ratios: 1: .88:1 2: 1:1 3: 3.21:1

1: Overdrive 2: Direct drive 3: Reduction

What is the maximum practical length of a one piece drive shaft and what happens if you exceed that length?

68 inches, whip

Explain how to check and set backlash on a rear axle

Dial indicator positioned against the back of the tooth and check the clearance

What are the two different types of pressure plates?

Diaphragm and coil

What are the five items you always do when replacing a clutch?

Disc, pressure plate, release bearing, pilot bearing, machine flywheel

If the transmission grinds when shifting in all forward gears, what would be the most likely cause of the concern?

Dragging clutch

There are three basic styles of cross and cardan joints, name and describe them

External clips (Dana), internal clips (Cleveland), and plastic molded (GM)

What is the main purpose of overdrive gears in transmission and transaxle?

Fuel economy

What type of noises are usually associated with bearing concerns?

Growling

If you had a bad 3/4 synchronizer, what gears would you gave hard shifting concerns with?

Hard shifts in third and fourth

What symptoms could result from a worn blocking ring on third gear?

Hard shifts into third

What is the purpose of the pilot bearing and where would it be located?

Support the front of the input shaft, located in flywheel or crankshaft

What are some problems associated with excessive end play in a transmission?

Jump out and hard shifting

What types of concerns are usually associates with shift linkage being out of adjustment?

Jump out and hard shifting

What is the purpose of a slip yoke on a rear driveshaft?

Length changes

What is the most common cause of shift concerns on transaxles?

Linkage

If a transmission is noisy in all gears, what would be the most likely cause of concern?

Low fluid

What are the wavy plates between the lining of the clutch and what do they do?

Marcel, they slow down engagement by being compressible

What should you do before removing any driveline component?

Mark it for position

Explain the difference between high and low range in a transfer case. Is 4x2 available in low range? Can 4x4 and 4x2 be used in direct drive? (Explain the difference)

No low two (?????)

Are all cable and hydraulic clutches adjustable? Explain why or why not

No, some are and some are not

When you push the clutch pedal to the floor (disengage the clutch), what bearing are you checking?

Pilot Bearing

What is the name of the bearing that is located in the rear of the input shaft and supports the internal pilot shaft?

Pocket bearing

How do auto locking hubs lock and unlock?

React to input torque and unlock when you back up

There are three types of ratios, name and describe them

Reduction = Small gear driving a large gear Overdrive = Large gear driving a small gear Direct Drive = Two gears of equal size or input locked to output

If you step on the pedal and push it past the free-play, what bearing are you checking?

Release Bearing

If you have a dial indicator positioned against the back face of a ring gear, what is the measurement you are making?

Ring gear runout

What is the most commonly used outer C.V. joint on a front wheel drive system and how sharp of angles is it capable of turning?

Rzeppa, turns up to 48 degrees

Based on axle and bearing design, describe the difference between full floating and semi floating axles?

Semi float carries weight and full float doesn't

Explain shift on the fly

Shifting into 4x4 while in motion

What type of final drive gear set do you find in an inline trans axle?

Spiral bevel

What gear tooth is most commonly used for reverse operation and why do you use that style?

Spur, it can be slid in and out of mesh

A transmission works normally in third gear, but stalls in all other gears. What is the most likely cause of the problem?

Third gear is seized (welded to the output shaft)

What is the name of the springs around the center of the clutch disc and what is their purpose?

Torsional dampeners, they absorb shock of engagement

How are differential lockouts operated on most four whee drive vehlices?

Traction control computer (TCC)

Define speed fluctuation on a drive shaft

Two driveline components turning at different speeds

What type of noise is usually associated with excessive gear wear?

Whining

Name the different styles of inner C.V. joints used on front wheel drive systems

tripot, double offset, and cross groove

What are the three main types of lubricants used in manual transmissions and transaxles?

ATF, gear oil, motor oil

Explain clutch adjustment, what are the specifications, and where do you check it?

Adjust free travel at pedal to OEM specs

Name the three types of gear sets based on pinion contact

Amboid = Above the center line Hypoid = Below the center line On the center line = spiral bevel

What are some causes of hard shifting?

Anything that makes it hard (that's what she said)

What is the name of the bronze piece in a synchronizer and what do they do?

Blocking ring, they speed up or slow down the gear during shifts

What is a double cardan joint and how is it classified? By what amount does it divide the angle?

CV joint, splits the angle equally in two

What does a full time four wheel drive need that a part time doesn't and what problem does it prevent?

Center differential, prevents driveline wind up

What is needed on a two piece driveshaft that a one piece driveshaft does not need?

Center support bearing

What are the two different means of connecting power to the front axle of a four wheel drive inside the transfer case?

Chains or gears

What is the name of the small teeth on the input shaft next to the drive gear, which can also be located on speed gears?

Clutching teeth, they lock the gear to the shaft through the synchronizer

What is the purpose of backlash?

Heat expansion and lubrication

What type of final-drive gear set do you find in a transverse transaxle?

Helical

What gear tooth design is usually used for forward speeds and why do you use that type?

Helical, quieter operation

In a rear drive axle, what is the most common type of gear set used?

Hypoid

What is the lubrication requirements of a hypoid gear set?

Hypoid gear oil (GL5)

What component is used on a front wheel drive instead of a slip yoke?

Inboard plunge joint

Explain how to set and measure pinion bearing preload and also what to do if the reading is too high?

Inch pound torque wrench and rotate, if reading is too high, replace the sleeve

If you hear a noise when the clutch is engaged (foot off the pedal), what bearing are you checking?

Input Shaft Bearing

Name the two different types of rear axle housings?

Integral and removable