1996 Chevrolet Corvette Owner's Manual - Page 255

Fluid should be added if the fluid level is at or below the ADD mark on the reservoir. There areadditional instructions on the reservoir cap. When returning the PCM to its proper position, make sure the unit is fully rearward in the bracket prior to installing the two screws. How to Check Lubricant Rear Axle When to Check Lubricant Refer to the Maintenance Schedule to determine how often to check the lubricant. See "Periodic Maintenance Inspections" in the Index. If the level is below the bottomof the filler plug hole, you'll need to add some lubricant. Add enough lubricant to raise the level to the bottomof the filler plug hole. 6-24