Chapter 8

Part-time four-wheel drive systems are automatically controlled systems.

False

Technician A says power can be locked into all four wheels merely by turning the locking hubs into the locked position. Technician B says some transfer cases use an electric switch to engage 4WD. Who is correct?

B only

The Society of Automotive Engineers (SAE) provides standard definitions applicable to AWD and 4WD systems which is used consistently by manufacturers to provide clarity.

False

Technician A says there may be three drive shafts connected to a transfer case. Technician B says one drive shaft is connected to the transfer case, directly from the transmission, and the other two are for driving the front and rear axles. Who is correct?

both A and B

Although the principles of operation are similar for all 4WD units, the components, location, and controls of the various systems differ primarily according to _____.

manufacturer and application

Full-time four-wheel drive _____.

is never disconnected

All-wheel-drive systems give the driver the option of 2WD or 4WD.

False

Most transfer cases, with low range available, use planetary gearsets.

True

Technician A says seals that are incorrectly installed can cause a leak in a transfer case. Technician B says noises in a transfer case or a differential can be caused by bad bearings. Who is correct?

both A and B

What is the central gear in a planetary gearset around which the rest of the gears rotate?

sun gear