Mercury F4AZ-5310-C Spring - Front

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For installation, set the upper insulator on top of the spring, using tape to hold it in place if necessary. Place the spring between its seat on the axle tube and the frame seat, with the pigtail (lower end) of the spring pointing toward the left side of the vehicle. Raise the axle assembly with a floor jack and insert the studs on the lower ends of the shocks into their holes in the brackets on the axle tubes. Install the stud retaining nuts, but don't fully tighten them yet. Snap the right parking brake cable into the upper suspension arm retainer, reinstall the rear stabilizer bar if applicable, and connect the height sensor connector link to the upper control arm. Install the wheels and lug nuts, lower the vehicle, and tighten the lug nuts to the specified torque. Before driving a vehicle equipped with air suspension, turn the air suspension switch to On, start the engine, and allow the compressor to inflate the air suspension springs (they deflate automatically when the rear of the vehicle is raised).

Loosen the wheel lug nuts. Raise the vehicle and securely support it on jackstands. Remove the wheels. On 1988 through 1991 models, disconnect the stabilizer bar from the link. Remove the shock absorber. Disconnect the center link from the Pitman arm. Use a suitable spring compressor, following the manufacturer's instructions, to relieve tension on the spring. Compress the spring. Remove the nuts and bolts securing the inner end of the lower control arm to the frame. Slowly lower the control arm. Remove the spring and compressor as a unit. Note the installation of the upper insulator between the upper end of the spring and the frame. If the spring is to be replaced, slowly loosen the spring compressor tool until all tension is removed, then remove the tool.

The vehicle must be raised and supported on jackstands, wheels removed, stabilizer bar disconnected (pre-1992 models), shock absorber and center link disconnected. A suitable spring compressor is installed to compress the spring, and the inner end of the lower control arm is detached from the frame. The control arm is lowered slowly to remove the spring and compressor.

Snap the right parking brake cable into the upper suspension arm retainer. Install the rear stabilizer bar. Connect the height sensor connector link to the upper control arm.

Use a jack placed under the axle housing to support the rear axle assembly. Additionally, position a safety chain through one of the spring coils and around a convenient frame member to prevent the spring from flying out before it's fully extended.

Place the spring upper insulator on the spring and secure it with tape. Install the spring compressor according to the manufacturer's instructions and compress the spring. Position the spring on the lower control arm, ensuring the lower end properly engages with the seat. On 1988 through 1991 models, align the end of the spring to cover the first hole in the lower control arm spring seat, leaving the second hole uncovered. Carefully raise the lower control arm, guiding the inner end to align with the bolt holes in the frame. Install the pivot bolts into the control arm and the frame. Loosely attach the nuts on the bolts. Attach the center link to the Pitman arm. Attach the lower end of the shock absorber to the lower control arm. On 1988 through 1991 models, attach the stabilizer bar to the link. Install the shock absorber. Install the wheels. Remove the jackstands, lower the floor jack, and lower the vehicle. Tighten the wheel lug nuts to the specified torque. After lowering the vehicle, tighten the lower control arm pivot bolt nuts to the specified torque. This can also be done with the vehicle on jackstands by raising the lower control arm with a floor jack to simulate normal ride height.