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It's not miles, but condition of shock absorbers that determine when they need to be replaced. If you seen hydraulic fluid weeping from them, the time is now. If the wheels of the vehicle bounce continuously while traveling on a highway at 45-65 miles per hour, the time is now. (Tire bounce may be hard to detect, unless the vehicle can be observed by a helper in a chase car, but it may be indicated if the vehicle is hard to control when going over potholes or railroad crossings.) If you jump on the bumper and the vehicle bounces for more than one cycle, the shock absorbers aren't doing their job and should be replaced. Admittedly, the Ford Expedition is a large, heavy vehicle, and the "jump test" may be difficult to perform, even for a guy weighing 180 pounds or more. Life expectancy for shock absorbers under typical street and highway conditions is around 40,000 to 60,000 miles, but possibly much less if the vehicle is operated primarily off-road or on roads in poor condition.

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Q: How many miles should you change shocks on 1998 ford expedition?
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