If the vehicle still has it's original shocks and struts, it is highly recommended to get them replaced; the rear shocks are most likely to be dead by now.  To check the rear shocks, jack the rear end up and check the tops of the strut bodies, right where the chrome shaft goes into the shock body.  If you see signs of fluid leakage, the shock needs to be replaced.  The front shocks usually last a bit longer than the rears, but it is still recommended to replace all four shocks (both front and rear) at the same time if you can afford it.

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