This procedure replaces both front coil springs on a 1966 Chevrolet Corvette with 327ci V8, requiring suspension disassembly and use of a spring compressor.

Warnings

Tools required

Parts

• Front coil spring (driver side) × 1 — Use OEM specification or equivalent with correct load rating
• Front coil spring (passenger side) × 1 — Use OEM specification or equivalent with correct load rating
• Upper control arm bumper (if worn) × 2 — GM part or equivalent rubber bumper
• Lower shock absorber mounting hardware × 2 — Replace if corroded

Preparation

1. Park vehicle on level, solid surface and engage parking brake firmly.
2. Chock rear wheels securely on both sides.
3. Loosen front wheel lug nuts while vehicle is on ground (do not remove).
4. Raise front of vehicle using floor jack positioned at center of front crossmember.
5. Position jack stands under front frame rails behind the front suspension crossmember, at designated lift points. Lower vehicle onto stands and verify stability.
6. Remove front wheels completely and set aside.
7. Spray all suspension fasteners with penetrating oil, particularly ball joint castle nuts, shock absorber mounts, and control arm pivot bolts. Allow to soak while proceeding.
8. Inspect spring compressor tool for damage, bent threads, or worn hooks. Do not use damaged equipment.

Procedure

1. 1

   Remove shock absorber lower mount
   Locate the lower shock absorber mounting bolt that passes through the lower control arm. Using a socket and wrench, remove the lower shock mounting bolt and washer. Pivot the shock absorber upward out of the way and secure with wire or bungee cord to prevent interference. The shock must be disconnected to allow full droop of the lower control arm.
2. 2

   Disconnect stabilizer bar link
   Locate the stabilizer bar link connecting the stabilizer bar to the lower control arm. Remove the stabilizer link bolt, nut, washers, and rubber bushings. Note the orientation and sequence of washers and bushings for reassembly. Set hardware aside in a labeled container. Repeat for opposite side if working on both springs simultaneously.
3. 3

   Install coil spring compressor
   Position the coil spring compressor tool on the coil spring with hooks engaging at least 2 full coils at both top and bottom of the spring. Ensure hooks are seated deeply into the coil windings and not at risk of slipping. The spring compressor must be installed with compression rods parallel to the spring axis. Verify all hooks are fully engaged and tool is centered on the spring before proceeding.
4. 4

   Compress coil spring
   Slowly and evenly tighten the spring compressor, alternating between compression points to maintain even compression. Compress the spring until there is visible slack between the spring and its seats on both the upper and lower control arms (approximately 1.5 to 2 inches of compression). The spring must be compressed enough that it is no longer under load against the control arms. Stop periodically to verify hooks remain fully engaged and centered.
5. 5

   Support lower control arm
   Position a floor jack under the outer end of the lower control arm, near the ball joint. Raise jack just enough to make contact and provide slight support, but do not lift the suspension. This prevents the control arm from dropping suddenly when the ball joint is separated.
6. 6

   Remove upper ball joint castle nut
   Locate the upper ball joint where the steering knuckle connects to the upper control arm. Remove the cotter pin from the castle nut. Using a deep socket, loosen the castle nut but leave it threaded on by approximately 2 threads to catch the knuckle if the ball joint separates suddenly.
7. 7

   Separate upper ball joint
   Using a ball joint separator tool (pickle fork or ball joint press), carefully separate the upper ball joint taper from the steering knuckle. Position the separator between the upper control arm and the steering knuckle, striking sharply if using a pickle fork type. Once the taper breaks free, remove the castle nut completely. The steering knuckle assembly will now pivot downward on the lower ball joint.
8. 8

   Remove compressed spring
   With the upper ball joint separated and spring fully compressed, carefully guide the spring and compressor assembly out from between the control arms. The spring may need to be rotated or angled to clear the control arms and shock tower. Work slowly and maintain control of the compressed spring at all times. Once clear, set the compressed spring assembly in a safe location away from the work area.
9. 9

   Inspect spring seats and components
   With the spring removed, inspect the upper and lower spring seats on both control arms for corrosion, damage, or deformation. Clean seats thoroughly with a wire brush. Inspect the upper control arm rubber bumper for cracks or deterioration and replace if necessary. Check lower control arm for cracks or damage. Inspect ball joint boots for tears and verify ball joint has no excessive play.
10. 10

    Install spring compressor on new spring
    Install the spring compressor on the new coil spring in the same manner as removal, with hooks engaging at least 2 full coils top and bottom. Compress the new spring to approximately the same compressed length as the old spring was when removed (typically 2 to 2.5 inches shorter than free height). Ensure even compression and verify all hooks are fully seated.
11. 11

    Install new spring assembly
    Carefully guide the compressed new spring into position between the upper and lower control arms. Ensure the lower spring end is properly seated in the lower control arm spring pocket with the spring end oriented to match the formed seat in the lower arm. Position the upper end of the spring into the upper spring seat pocket in the frame crossmember. Verify proper seating before proceeding.
12. 12

    Reconnect upper ball joint
    Using the floor jack under the lower control arm, carefully raise the steering knuckle until the upper ball joint stud can be inserted through the knuckle. Align the stud with the hole and push the knuckle fully onto the taper. Install the castle nut and tighten to the factory service manual specification (value must be verified against the 1966 Corvette service manual before use). Continue tightening until the next castle slot aligns with the cotter pin hole, then install a new cotter pin and bend ends securely.
13. 13

    Release spring compressor
    With the upper ball joint reconnected, slowly and evenly release tension on the spring compressor. Alternate between compression points to release evenly. As tension releases, the spring will seat fully into both upper and lower spring pockets. Once all tension is released and spring is fully seated, carefully remove the spring compressor tool. Verify spring ends are properly seated in their pockets and not cocked or misaligned.
14. 14

    Reinstall stabilizer bar link
    Reconnect the stabilizer bar link to the lower control arm using the original hardware (or new hardware if original was damaged). Install in the correct sequence: bolt, washer, bushing, control arm, bushing, washer, nut. Tighten the stabilizer link nut until the rubber bushings are compressed to approximately their original thickness but not over-compressed. Tighten only until the rubber bushings are compressed to approximately their original thickness; verify exact torque against the 1966 Corvette service manual and do not over-tighten.
15. 15

    Reinstall shock absorber lower mount
    Position the lower end of the shock absorber back through the lower control arm mounting hole. Install the lower shock bolt with washer and tighten securely. Tighten the lower shock mounting bolt to the factory service manual specification (value must be verified against the 1966 Corvette service manual before use). Ensure shock is not twisted and moves freely through its travel.
16. 16

    Repeat for opposite side
    Perform steps 1 through 15 for the opposite side front spring, following the exact same procedure. Maintain the same level of care and attention to spring compressor safety and ball joint separation.
17. 17

    Reinstall wheels and lower vehicle
    Reinstall both front wheels, threading lug nuts on by hand initially. Tighten lug nuts in a star pattern until snug but not fully torqued. Raise vehicle slightly with floor jack and remove jack stands. Lower vehicle to ground completely. Torque lug nuts in a star pattern to the factory specification for the 1966 Corvette (verify exact value against the service manual; commonly cited around 65-80 ft-lb).

Reassembly

1. All fasteners should be torqued to manufacturer specifications. Consult a factory service manual for specific torque values not provided in this procedure.
2. New cotter pins must be installed in all ball joint castle nuts. Never reuse old cotter pins.
3. If any ball joint boots were damaged during disassembly, they must be replaced before returning the vehicle to service.
4. Verify stabilizer bar links are not over-tightened, which would restrict suspension travel and damage bushings.

Verification

• With vehicle on ground, bounce each front corner several times to settle suspension. Listen for any unusual noises such as spring binding, metal-to-metal contact, or loose components.
• Verify springs are fully seated in upper and lower spring pockets by visual inspection through wheel well.
• Check that steering moves smoothly through full lock-to-lock travel with no binding or interference.
• Test drive vehicle at low speed in a safe area, checking for unusual handling, pulling, or suspension noise.
• Have front end alignment checked immediately. Spring replacement will affect camber, caster, and toe settings. Driving with improper alignment will cause tire wear and poor handling.
• After 50-100 miles, recheck torque on all suspension fasteners, particularly upper ball joint castle nut and shock absorber mounts.

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