3 Essential Things to Know about Four-Wheel Drive (4WD) | YourMechanic Advice

3 Essential Things to Know about Four-Wheel Drive (4WD)

Four-wheel drive is a form of drivetrain. A four-wheel drive vehicle has two or more axles, which provide power to four wheel ends. These vehicles have a transfer case, which means the front and rear drive shafts will be locked together when the four-wheel drive is engaged.

Benefits of Four-Wheel Drive

Four-wheel drive is ideal for driving in situations when there is low to very little traction. For example, if you frequently drive in snow, or take your vehicle off-road, you will greatly benefit from four-wheel drive. Some modern vehicles engage four-wheel drive automatically, so you do not have to do anything to turn it on. The automatic system normally turns on when one or more of the wheels start slipping. Other vehicles have the option of turning four-wheel drive on and off. The benefit of turning it on and off is to improve the fuel economy.

4WD vs. All-Wheel Drive

Not all four-wheel drive vehicles are considered all-wheel drive. There is a difference between the two, which we will look at. The term all-wheel drive is applied to drivetrain systems that include a differential between the front and rear drive shafts. All-wheel drive vehicles comes with anti-slip technology and work well on all surfaces. Four-wheel drive vehicles have a transfer case, which is different than the all-wheel drives’ differential. This is the main difference between the two types of drivetrains.

Problems with Four-Wheel Drive

Heavy loads that four-wheel drive vehicles carry are more likely to cause sagging springs in the suspension. These sagging springs can lead to chassis damage. If the four-wheel drive vehicle was used to pull boats or for driving off-road, there may be rust around the bottoms of the door. Four-wheel drive vehicles require more maintenance because of the extra parts, such as the differentials, transfer case, etc. Check the maintenance record to ensure these were properly maintained over time. The chassis can take a beating over time due to neglect or hard driving. Check for cracks where the chassis outriggers join the main frame. Also, check for dents or rust, which also indicates the vehicle was used roughly.

Four-wheel drive vehicles are convenient and can provide more traction on slippery roads or while off-roading. Four-wheel drive is different than all-wheel drive, so it is important to know the difference when purchasing a vehicle.


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Marvelous job done by Mazyar on my car. He was friendly and does not mind if you watch him perform the job. He will even show you what he is doing and how. He too will show you if he finds a problem with the vehicle so you can see for yourself. I say this because he was only supposed to change the oil and filter but I told him about a noise I keep hearing in the suspension. He inspected the suspension while he was underneath the car and came to find out it was the stabilizer bar links. He was patient at finding the issue and never rushed through it just because it was not part of the service. This shows me that he indeed cares about the customer and its vehicle and does not mind doing extra, as long as the customer is satisfied with his work and and all questions are answered. I will sure be using him for future services.
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26 years of experience
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Nissan Altima - Oil Change - Tujunga, California
Nazareth was prompt, friendly and efficient. He had an earlier cancellation and called to offer an earlier appointment. He is very knowledgeable and wiling to take the time to explain things in detail with no jargon. He offered a detailed explanation of my car's condition and additional repair items required. I'm a former auto mechanic from the 1970's and I can say that I'm very pleased with the service Nazareth provided.

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