Replace worn subframe bushings on a 1966 Chevrolet Corvette C2 to restore chassis rigidity and handling precision.

Warnings

Tools required

Parts

• Front subframe bushing set (4 pieces) × 1 — Use OEM specification or equivalent polyurethane upgrade
• Subframe mounting hardware kit (if corroded) × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake.
2. Disconnect negative battery cable.
3. Raise front of vehicle and support on jack stands at frame rails behind front subframe mounting points — never support by body or suspension components.
4. Remove both front wheels to improve access and reduce subframe weight.
5. Spray all subframe mounting bolts with penetrating oil and allow 15-30 minutes to soak.
6. Inspect subframe and mounting hardware for damage or excessive corrosion that may require additional parts.

Procedure

1. 1

   Document subframe alignment
   Before disassembly, measure and record the position of the subframe relative to the main frame rails. Mark the subframe mounting points with paint or scribe marks to ensure proper alignment during reinstallation. Measure from a fixed reference point on each frame rail to the corresponding subframe mount — this will be critical for maintaining proper front suspension geometry and steering alignment.
2. 2

   Disconnect steering linkage
   Locate the steering coupling connection between the steering column and the steering box on the subframe. Remove the coupling pinch bolt and carefully separate the steering shaft from the steering box input shaft. Mark the relationship between the two shafts before separation to maintain proper steering wheel alignment on reassembly.
3. 3

   Support the subframe assembly
   Position a transmission jack or sturdy floor jack with a wide wooden platform under the center of the subframe. Raise the jack until it just contacts the subframe and supports its weight, but does not lift the vehicle. Secure the subframe to the jack with a chain or ratchet strap to prevent shifting during removal. The subframe must remain stable throughout the bushing replacement process.
4. 4

   Remove subframe mounting bolts
   Locate the body mount bolts that secure the fiberglass body to the perimeter frame. The C2 Corvette uses body mount cushions (bushings) at multiple points along the frame, NOT a bolt-on front subframe — verify the actual mount locations and count against a factory service manual before proceeding. Using a breaker bar and the correct socket size (verify against the factory manual), remove the body mount bolts. These bolts pass through the subframe bushings. Support the subframe with the jack throughout this process to prevent sudden dropping. Carefully lower the jack approximately 2-3 inches to provide access to the bushings while keeping the subframe safely supported.
5. 5

   Remove old front bushings
   With the subframe lowered, access the front bushings where they mount between the subframe brackets and the main frame. The original rubber bushings consist of an outer sleeve bonded to rubber with an inner metal sleeve. If the bushings are still captured in the subframe brackets, use a bushing press or C-clamp setup with appropriate receiver cups to press the old bushings out of their mounting locations. Apply steady pressure to avoid damaging the bracket mounting ears. If bushings are severely deteriorated and bonded to the frame bolts, carefully cut away rubber material with a utility knife and collapse the outer sleeve to remove.
6. 6

   Remove old rear bushings
   Access the rear subframe bushings using the same method as the front. The rear bushings may be more deteriorated due to heat from the transmission and exhaust system. Press or drive out the old bushings from their mounting locations. Inspect the rear mounting brackets carefully for heat damage or elongation of the mounting holes.
7. 7

   Clean mounting surfaces
   Thoroughly clean all bushing mounting bores in both the subframe brackets and frame mounting points using a wire brush and solvent. Remove all old rubber residue, corrosion, and debris. The mounting surfaces must be clean and smooth for proper new bushing installation. Inspect each mounting bore for cracks, elongation, or damage that could compromise the new bushing installation.
8. 8

   Install new front bushings
   Apply a light coat of dish soap solution or bushing installation lubricant to the outer surface of the new front bushings — never use petroleum-based lubricants that can degrade rubber. Position the new bushing in the subframe bracket with proper orientation (note any offset or directional markings). Using a bushing press, C-clamp setup, or hydraulic press with properly sized driver and receiver, press the new bushing straight into the mounting bore until fully seated and flush with the bracket face. Ensure the bushing is not cocked or damaged during installation.
9. 9

   Install new rear bushings
   Install the rear bushings using the same method as the front bushings. Ensure proper orientation and press the bushings fully into their mounting locations until seated flush with the bracket faces. Verify that all 4 new bushings are properly seated before proceeding.
10. 10

    Raise and align subframe
    Using the transmission jack, carefully raise the subframe back to its original mounting position. Align the subframe to the main frame using the reference marks made during disassembly. The subframe must be positioned precisely to maintain proper suspension geometry and steering alignment. Use a pry bar if necessary to fine-tune alignment, but ensure the jack continues to support the full weight of the subframe.
11. 11

    Install subframe mounting bolts
    Insert all 4 subframe mounting bolts through the frame, new bushings, and subframe brackets. Start all bolts by hand to ensure proper thread engagement. Do not fully tighten bolts at this stage. The bolts should pass through the new bushing inner sleeves without binding.
12. 12

    Torque subframe mounting bolts
    With the vehicle weight on the jack stands and the subframe supported at its normal ride height position, torque all 4 subframe mounting bolts to specification in a cross pattern (front left, rear right, front right, rear left). No verified torque specification is available in this procedure. Do NOT guess — consult the 1966 Corvette Chassis Service Manual for the correct body mount bolt torque before final tightening. This ensures even loading of all bushings and prevents distortion.
13. 13

    Reconnect steering linkage
    Align the steering column shaft with the steering box input shaft using the alignment marks made during disassembly. Install the steering coupling pinch bolt and tighten securely. Verify that the steering shaft can rotate freely without binding and that the steering wheel is centered when the front wheels are pointed straight ahead.
14. 14

    Reinstall wheels and lower vehicle
    Reinstall both front wheels and torque lug nuts to specification in a star pattern. Carefully lower the vehicle from the jack stands and remove all jacks. Reconnect the negative battery cable.

Reassembly

1. Torque wheel lug nuts to proper specification after vehicle is on the ground (typically 80-90 ft-lb for 1966 Corvette).
2. If polyurethane bushings were used instead of OEM rubber, expect firmer ride quality and improved handling precision.
3. New bushings may require a 500-mile settling period before final geometry check.

Verification

• Start engine and verify steering operates smoothly through full lock-to-lock range without binding or unusual noises.
• Perform a visual inspection under the vehicle to confirm all 4 subframe mounting bolts are properly installed and torqued.
• Test drive vehicle at low speed in a safe area to verify elimination of clunking or knocking noises during acceleration, braking, and cornering.
• Schedule a professional front-end alignment within 100 miles to ensure proper suspension geometry after bushing replacement.
• After 50-100 miles of driving, re-torque all 4 subframe mounting bolts to specification as new bushings may settle slightly.

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