I just purchased a 1978 Silver Anniversary corvette, with 20672 miles, that has been in storage for 8 years. It was put up by GM specifications, drained oil and filled up with a motor preservative, drained radiator and re-filled with antifreeze, drained gas tank, removed wheels and set car on blocks. It was stored in a garage for 6 years and outside, covered up for 2 years. It has a 4 speed transmission. Should I replace the grease in the transmission and rear end, before I run it, and if so what weight and type do I replace it with. Also what would be a good high performance motor oil and what weight should I use?