Exam 44: Four- and All- Wheel Drive

Which of the following is not a routine transfer case servicing procedure?

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

Most passenger cars with 4WD are designed for the rigors of off-road driving, in which clearance over rocks and debris is needed.

Technician A says the viscous clutch is filled with silicone fluid. Technician B says the viscous clutch solenoid is controlled by inputs from the wheel speed sensors. Who is correct?

Some 4WD vehicles with automatic locking hubs can become stuck in a situation where they need traction at the front wheels to get unstuck, but because the hubs disengage the front wheels in reverse, the vehicle is incapable of moving.

Technician A says in a full-time AWD transmission/transfer case, the hydraulic clutch that controls slippage in the 4WD system is controlled by inputs from the ABS wheel speed sensors. Technician B says some full-time AWD transfer cases can lock the differential so that the front and rear driveshafts must turn at the same speed. Who is correct?

In an automatic AWD vehicle, normally one axle receives all the torque; when slippage occurs, 50 percent of the torque can be sent to the other axle by _____ means.

When a difference in speed of ____________________ percent exists between the input and output of a viscous clutch the clutch, will lock the input to the output.

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

Some 4WD vehicles that have been adapted from a FWD format use a(n) ____________________ take-off to transmit torque to the rear driveline.

Front hubs on 4WD vehicles are being discussed. Technician A says front hubs lock automatically. Technician B says front hubs must be manually engaged. Who is correct?

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

Under what conditions should the interaxle differential be locked?

When should the interaxle differential lockup be applied?

The Haldex clutch in the all-wheel drive automatic transaxle takes the place of the ______.

Two technicians are discussing transfer case shifting mechanisms. Technician A says the transfer case range is controlled by a shifter lever and mechanical linkage. Technician B says the transfer case range is controlled electrically by a switch on the dash and an electric motor on the case. Who is correct?

What will happen if the manual locking hubs remain in the 4WD or locked position when the vehicle is driven in 2WD mode?

Technician A says an all-wheel drive vehicle uses a differential at both axles. Technician B says some four-wheel drive vehicles use an interaxle differential. Who is correct?

An interaxle differential lowers performance in poor traction conditions.

Many transfer cases require _____ lubricants as used in differentials and in some manual transmissions.