Installation Instructions
1976–1982 Corvette Rear Trailing Arm Upper Rubber Bumper
GM Part Number: 483746
Mid America Motorworks Part #: 602802
Required Tools:
• 3/8" or 1/2" drive ratchet
• 9/16" socket and open-end wrench
• Torque wrench (recommended)
• Jack and jack stands (or lift)
• Penetrating lubricant (if bolts are corroded)
Step 1 – Safety First Park your Corvette on a level surface. Set the parking brake and block the front wheels. Raise the rear of the car using a jack and support it securely on jack stands placed under the frame rails. Never work under an unsupported vehicle.
Step 2 – Locate the Mounting Point Locate the rear trailing arm upper bumper bracket on the inside of the rear frame rail, just above the trailing arm. The original bumper is mounted to this bracket with a bolt and nut.
Step 3 – Remove the Old Bumper If replacing an original or damaged bumper: - Spray the nut and bolt with penetrating lubricant and allow it to soak. - Use a 9/16" wrench and socket to remove the hardware. - Discard the old bumper and any rusted or deformed hardware.
Step 4 – Inspect the Bracket Check the bracket for corrosion or damage. Clean the surface to ensure a flat, secure mount.
Step 5 – Install the New Bumper Position the new bumper and insert the supplied bolt through the bracket and bumper. Secure with the included nut. Torque Spec: Tighten to 25–30 ft-lbs.
Step 6 – Repeat on Opposite Side Repeat for the second bumper on the opposite side. Two are required per Corvette.
Step 7 – Final Check Lower the vehicle and remove jack stands. Verify proper bumper positioning and trailing arm clearance.