The C3 Corvette was manufactured between 1968 and 1982. This sports car model incorporates a nine-leaf rear spring assembly secured with spring bolts and bushings. After years of service, these bushings can become cracked and worn. It is a good idea to replace the spring bolts and nuts at the same time as they will most likely be rusted and corroded. Spring bolt kits can be purchased from most Corvette parts suppliers that include new bolts, washers and bushings.
Tools Used: Wheel chocks, Jack, Jack stands, Tire tool, Lug wrench, Open-end wrench set, Socket set, Penetrating lubricant, Block of wood, C-clamp, Rear spring bushings, Tape measure
Install the Rear Spring Bushings
Park the car on a level surface. Block the front wheels of the car to keep it from moving. Raise the rear of the car with a hydraulic jack then secure the car on jack stands. Remove the lug nuts on the rear tires with a tire tool then remove the wheels to access the spring bolt area.
Locate the rear leaf spring assembly bolts at the ends of the spring. These are 9/16-inch bolts between 7 and 8 inches long that connect the trailing arm to the spring.
Spray penetrating lubricant onto the threads of the spring bolt. Allow it to soak in for about 30 minutes to remove some of the rust for easier removal.
Place a small block of wood under the end of the spring and attach it with a C-clamp. Position a hydraulic jack directly under the block of wood and raise it just enough to relieve pressure off the spring nut. The block of wood will keep the jack from slipping off the spring.
Remove the spring nut with an open-end wrench or socket. Pull the mounting bolt through the top of the trailing arm channel and remove the washers and bushings. Inspect the integrity of the bolt, washers and nut. Replace them if necessary.
Place the top bushing between two washers inside the trailing arm channel. Place the lower bushing between two washers under the bottom of the spring. Push the bolt through the top of the channel then through the new bushings and attach the nut. Count the threads at the end of the bolt so you can match them on the opposite side. Repeat the process on the other side of the spring.
Replace the wheels, remove the jack stands and lower the car. Level the car by measuring the distance from the ground to the top of the arch inside the rear wheel openings. Make any changes by adjusting the spring bolt nut. Turn the bolt clockwise to raise each side of the car and counterclockwise to lower it. Drive the car for about 300 miles to allow the suspension to settle. Re-measure and adjust as necessary.
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