Ford HG9Z-5310-H Spring - Front

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Check the shock body for leaking fluid, dents, cracks, and other obvious damage which would warrant replacement.

Examine the shock for signs of fluid leakage. Check the piston rod for signs of pitting along its entire length, and check the shock body for signs of damage. Test the operation of the shock, while holding it in an upright position, by moving the piston through a full stroke, then through short strokes of 2 to 4 inches. In both cases, the resistance felt should be smooth and continuous. If the resistance is jerky or uneven, or if there is any visible sign of wear or damage, replacement is necessary.

Support the trailing arm with another floor jack. If you don't have another floor jack, remove the caliper and hang it out of the way with a length of wire.