Exam 44: Four- and All-Wheel Drive

Locking hubs are generally found on ______.

A vacuum leak could prevent a vehicle from engaging 4WD.

What is the main advantage of all-wheel drive?

In a part-time four wheel drive systems, 4WD should not be selected when the vehicle is traveling on dry surfaces.

Technician A says some AWD systems have a center differential. Technician B says some AWD vehicles have a viscous clutch. Who is correct?

Front drive axle shafts used on a 4WD vehicle require U-joints or CV joints.

Technician A says the transfer case splits torque from the transmission to the front and rear axles. Technician B says viscous clutch units can be overhauled. Who is correct?

The result of having a different gear ratio in the front axle than in the rear axle will cause a phenomenon called driveline ____________________.

A four-wheel drive vehicle requires four drive shafts.

Identify the gear selector positions available in a conventional 4WD transfer case.

If the 4WD indicator light is flashing on and off, ______.

Full-time 4WD vehicles require locking hubs at the front wheels.

Technician A says viscous couplings are electronically controlled. Technician B says Haldex clutches are electronically controlled. Who is correct?

Technician A says a vacuum motor engages some 4WD front axles. Technician B says an electrical motor engages some 4WD front axles. Who is correct?

A ratcheting sound from an automatic locking hub may be caused by ______.

Technician A says wheel bearings on 4WD vehicles are permanently sealed and lubricated and do not require disassembly and service after the hubs have been submerged in water. Technician B says a frequent cause of wheel bearing failure is the use of oversized tires mounted on wheels with substantial offset. Who is correct?

Under what conditions should the interaxle differential be locked?

Identify two disadvantages of 4WD systems, when compared to 2WD systems.

Interaxle differentials are being discussed. Technician A says the interaxle differential is located inside the front axle housing. Technician B says the interaxle differential is located inside the rear axle housing. Who is correct?

Front axle disconnect systems are being discussed. Technician A says the systems use a vacuum motor to disengage and engage the right side axle shaft from the differential. Technician A says an electric motor is used to engage and disengage the axle. Who is correct?