HALF-SHAFT U-JOINT REPLACEMENT
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When the car is at the maximum elevation, place jack stands under the chassis rails just in front of the rear tires. A piece of ½" plywood under the jack stands will keep them from digging into the blacktop if you're working in your driveway. Once the jack stands are securely positioned, lower and remove the floor jack.
Elevate the car by placing the pad of a floor jack beneath the rear spring securing plate.
Normally, these little workhorses require no maintenance other than periodic greasing. However, as with all things mechanical, parts eventually fail or wear out. Such was the case with our '76 Shark project car. While cruising along at 65 MPH a slight vibration quickly became very pronounced, accompanied by a loud thumping sound. Upon pulling over to the side of the road to investigate the cause, it was discovered that the outboard (wheel side) u-joint on the passenger side of the car had given out. Preferring to err on the side of caution, we decided to replace all of the u-joints on both half-shafts when we got the car back to the shop garage, reasoning that if one let go for apparently no good reason, the others also may follow suit eventually. Here's what it took to remove the old u-joints on the half-shafts and replace them with new ones. The procedures are the same for all C2 and C3 Corvettes.
HALF-SHAFT U-JOINT REPLACEMENT