by 
The Curious Bag
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<h4 class="dechead">On One Hand: Waste of Money
Though front-wheel alignments are crucial to handling and safety, the simple rear axle on most cars usually maintains its settings. This is especially true of front-drive cars, whose rear axles do little more than suspend the back of the car.
On the Other: Can't Be Too Sure
Rear-wheel and all-wheel drive cars have very complex rear suspensions that are just as likely to go out of alignment as the front. This is especially true in newer cars that tend to have fully independent suspensions. Toe angles and camber settings can easily go out of adjustment, especially when a car is lowered or regularly carries a lot of weight.
Bottom Line
Whether a car needs four-wheel alignment depends upon the vehicle. Lowered cars or those with other suspension modifications should always get a four-wheel alignment before driving, and older cars with independent suspensions will almost certainly need some adjustment. Of course, this assumes that your car even has an adjustable rear suspension, which most do not.
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