Replacement of the front coil springs on a 1966 Chevrolet Corvette, requiring suspension disassembly and compressed spring removal.

Warnings

Tools required

Parts

• Front coil spring (pair recommended) × 2 — Use OEM specification or equivalent aftermarket
• Upper control arm bumper (if damaged) × 2 — Use OEM specification
• Shock absorber mounting hardware (if corroded) × 1 — Use OEM specification

Preparation

1. Park vehicle on level, solid concrete surface and apply parking brake firmly.
2. Place wheel chocks behind rear wheels.
3. Loosen front wheel lug nuts while vehicle is on ground, but do not remove.
4. Raise front of vehicle with floor jack at factory front crossmember jacking point.
5. Place jack stands under frame rails just behind front wheel wells, ensuring stable support.
6. Remove front wheels completely.
7. Spray all suspension fasteners with penetrating oil and allow to soak for 15-30 minutes.
8. Verify coil spring compressor is in good working order and rated for automotive use.

Procedure

1. 1

   Disconnect shock absorber lower mount
   Working from under the vehicle, locate the lower shock absorber mounting bolt that passes through the lower control arm. Using a 9/16 inch socket and wrench, remove the lower shock mounting bolt and washer. Push the shock absorber up and secure it out of the way with wire or a bungee cord to provide working clearance.
2. 2

   Disconnect stabilizer bar link
   Locate the stabilizer bar link connection to the lower control arm. Remove the link bolt, nut, washers, and rubber bushings. Note the orientation and order of washers and bushings for reassembly. Swing the stabilizer bar link away from the lower control arm.
3. 3

   Support lower control arm
   Position a floor jack with a block of wood under the lower control arm, near the spring seat area but not directly under the spring. Raise the jack just enough to slightly compress the coil spring and take load off the suspension (approximately 1-2 inches of upward pressure). This supports the control arm during ball joint disconnection.
4. 4

   Disconnect lower ball joint from steering knuckle
   Remove the cotter pin from the lower ball joint castle nut. Using a 3/4 inch socket, loosen but do not fully remove the castle nut (leave it threaded on 2-3 turns to protect threads). Using a ball joint separator or pickle fork, break the taper between the ball joint stud and the steering knuckle. Tap the separator firmly with a hammer until the joint releases. Remove the castle nut completely and separate the steering knuckle from the lower ball joint.
   ⚠The ball joint will release suddenly when the taper breaks. Keep hands and body clear of pinch points.
5. 5

   Lower control arm and decompress spring
   With the steering knuckle separated, slowly and carefully lower the floor jack supporting the lower control arm. Lower it gradually until the coil spring is fully extended and no longer under any compression load. The spring should be loose between the upper and lower spring seats. Remove the jack completely from under the control arm.
6. 6

   Install spring compressor
   Install the coil spring compressor tool onto the extended coil spring, following the manufacturer's instructions for your specific compressor type. Position the compressor hooks or jaws evenly on opposite sides of the spring, engaging at least 3 full coils on each side. Ensure the compressor is centered and properly seated before applying any compression force.
   ⚠️Improper spring compressor installation can result in the compressor slipping off under load, releasing the spring violently. Double-check that all compressor components are properly engaged and tightened.
7. 7

   Compress and remove spring
   Slowly and evenly tighten the spring compressor, compressing the coil spring until it is short enough to clear both the upper and lower spring seats (typically 4-6 inches of compression required). Periodically check that the compressor remains centered and properly engaged. Once adequately compressed, carefully maneuver the spring assembly out from between the control arms. Fully decompress and remove the old spring from the compressor in a safe area away from the vehicle.
   ⚠️Never place any body part in the path of a compressed spring. Work slowly and maintain full control of the spring during removal.
8. 8

   Inspect spring seats and insulators
   With the spring removed, inspect the upper spring seat (in the frame crossmember pocket) and lower spring seat (on the lower control arm) for damage, corrosion, or wear. Wire brush both seats clean. Check the rubber spring insulators on both seats; replace if cracked, torn, or compressed flat. Inspect the upper control arm jounce bumper for damage and replace if torn or missing.
9. 9

   Compress and install new spring
   Install the new coil spring into the spring compressor tool with the same orientation as the original (note that springs may have a tighter pitch at one end, which typically faces the lower control arm). Compress the new spring to the same length as the old spring was compressed during removal. Ensure the spring is centered in the compressor before proceeding.
10. 10

    Position new spring in suspension
    Carefully maneuver the compressed new spring into position between the lower control arm and the frame crossmember pocket. Align the spring ends with the spring seats, ensuring the end coils properly seat in the formed pockets of both the crossmember and lower control arm seats. Verify that any rubber insulators are in place and properly positioned.
11. 11

    Release spring compression
    Using the floor jack with wood block, raise the lower control arm slightly to help guide the spring into its seats. Slowly and evenly release tension on the spring compressor, allowing the spring to expand into position. Ensure the spring remains properly seated in both upper and lower seats as it expands. Once the spring is fully expanded and seated with no load on the compressor, carefully remove the compressor tool.
    ⚠Monitor spring seating continuously during decompression. If the spring begins to slip out of its seat, immediately stop and reposition before continuing.
12. 12

    Reconnect lower ball joint
    Using the floor jack, raise the lower control arm to bring the lower ball joint stud back into alignment with the hole in the steering knuckle. It may be necessary to use a pry bar to align the knuckle. Insert the ball joint stud through the knuckle and install the castle nut. Tighten the castle nut to the factory-specified torque for the 1966 Corvette lower ball joint stud (verify exact value in the GM Chassis Service Manual before final tightening). Advance the nut to the next slot if needed to align the cotter pin hole; never back off to align. Install a new cotter pin through the castle nut slots and ball joint stud, bending the ends to secure.
13. 13

    Reconnect stabilizer bar link
    Reconnect the stabilizer bar link to the lower control arm, installing the rubber bushings, washers, bolt, and nut in the correct order as noted during disassembly. Tighten the link bolt nut snugly, compressing the rubber bushings slightly but not excessively (typically 15-20 ft-lbs).
14. 14

    Reconnect shock absorber lower mount
    Pull the shock absorber down into position and align the lower mounting eye with the hole in the lower control arm. Insert the lower shock mounting bolt with washer and tighten to the factory-specified torque for the 1966 Corvette front shock lower mount (verify exact value in the GM Chassis Service Manual before final tightening). Ensure the shock moves freely through its travel without binding.
15. 15

    Repeat procedure for opposite side
    Repeat steps 1 through 14 for the opposite front coil spring. It is critical to replace both front springs even if only one is damaged to maintain balanced ride height and handling characteristics.

Reassembly

1. Reinstall front wheels and hand-tighten lug nuts in a star pattern.
2. Carefully raise vehicle slightly with floor jack and remove jack stands.
3. Lower vehicle to ground gradually.
4. Torque wheel lug nuts to 80 ft-lbs in a star pattern with vehicle on ground.
5. Remove wheel chocks.

Verification

• With vehicle on level ground, inspect ride height at both front corners. They should be equal within 1/2 inch.
• Rock the vehicle by pushing down firmly on each front corner. The suspension should rebound smoothly without binding or unusual noises.
• Check that all suspension fasteners are properly tightened and cotter pins are installed.
• Test drive the vehicle at low speed in a safe area, checking for unusual noises, vibrations, or handling issues.
• Have the front-end alignment checked and adjusted by a professional shop, as suspension disassembly will have affected camber, caster, and toe settings.

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