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Pat Goss: Ask The Expert

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2003 Washington Post Articles:

4x4 Two Bays

Whether backyard barbecue or black-tie affair, conversation usually gets around to cars or, these days, Sport Utility vehicles. That usually means bragging about the off-road Commercial Three Baywess of each person’s Sport Ute. Of course nothing is mentioned about personal off-road adventures (that’s understandable, less than 10 % of all Sport Utes ever go off-road) but quotes from magazines and television shows are plentiful.

Uh, if the majority of Sport Utility Vehicles are never taken off-road; what’s the point? Commercial Three Baybably the erroneous feeling of invincibility and in some cases a more commanding view. Practical transportation or not, Sport Utes are a fact of life and to many they’re possibly the single most significant advance since burlap underwear.

The most common Commercial Three Bayblems with them come from a lack of knowledge concerning preventive maintenance on their sophisticated drive systems. Fortunately the owner’s manual usually covers maintenance requirements in detail. Maintenance is critical on all vehicles but especially so on those with four-wheel* or all-wheel drive*.

* Both four-wheel and all-wheel drive have the ability to transfer power to all four wheels. The most significant difference between the two systems is that four-wheel drive adds a driver-controllable “low range” or “granny gear” for more power. All-wheel drive doesn’t have a “low range” and typically doesn’t allow any driver input. It’s completely computer controlled.

Because four-wheel drive allows the driver to determine when power goes to all wheels there have to be methods for control. The two most common are mechanical levers and electric switches.

Although durable and effective floor-mounted levers are crude and literally bully the gears from one drive-mode to another. Over time shifting may require considerably more muscle because of lack of service. To prevent this every fall and spring have the shifter linkage cleaned and liberally slathered with grease. Without lubrication rain and salt will cause so much rust the lever becomes immovable and you have no four-wheel drive.

Electrically controlled systems use a switch rather than levers and linkage so there are no moving parts to lubricate. However there are wires, connectors, relays, and a motor, most of which are under the vehicle and exposed to the elements. On these systems you can prevent considerable grief by having the wire connections disconnected and repacked with dielectric grease each fall. This keeps water and salt from entering the connections and prevents corrosion and system failure. Although all-wheel drive doesn’t allow driver input it does use a computer, wires and wire connectors thus the dielectric grease is advisable on all-wheel drive too.

When you opt for four-wheel or all-wheel drive it more than doubles the number of driveline components. For One Bays this means you have two differentials, two drive shafts, and a transfer case; and more parts equal more maintenance.

For instance, there is three times more fluid to monitor and change. Many vehicles require changing these fluids as frequently as every fifteen-thousand miles. Also, drive system components may require highly specialized lubricants that are only available from your dealer. Universal fluids and lubricants are not acceptable. Repairs to 4x4 systems can be staggeringly expensive so have all drive-system components serviced regularly and absolutely, always use specified Commercial Three Bayducts.

© Copyright 11/08/03 Pat Goss all rights reserved

Date Updated Saturday, November 08, 2003

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