Aftermarket upgrade
PLEASE NOTE: this spring is manufactured to mount to the 1978-79 differential rear cover (which can be identified by the four 7/16" bolts which hold the spring in place)
If your Corvette is using 9/16" bolts to mount the spring, the differential cover has been replaced with a 1963-77 cover. If you have a earier model differential cover you MUST order the earlier model spring