2003 Chevrolet Corvette Owner's Manual - Page 86

If your engine speed drops below 900 rpm, or if the engine is not running smoothly, you should downshift to the next lower gear. You may have to downshift two or more gears to keep the engine running smoothly or for good engine performance. After shifting to FOURTH (4), you may downshift to a lower gear if you prefer. Notice: When you are shifting gears, don't move the gearshift lever around needlessly. This can damage parts of the transmission and may require costly repair. Shift directly into the next appropriate gear. Notice: Do not try to force the shift lever into SECOND (2) or THIRD (3) when the1 TO 4 SHIFT light comes on. Do not try to re-engage FIRST (1) after starting to shift into FOURTH (4). You will damage only from FIRST (1) to your transmission. Shift FOURTH (4) when the light comes on. This light will come on when: e One to Four Shift Light (Manual Transmission) When this light comes on, you can only shift from FIRST (1) to FOURTH (4) instead of FIRST (1) to SECOND (2). The engine coolant temperature is higher than 169°F (76"C), you are going 15 to 19 mph (24 to 31 km/h) and e you are 21 percent throttle or less. 1TO4 SHIFT Downshifting (Manual Transmission) If your vehicle is a coupe or convertible, do not downshift into the gear shown below at a speed greater than shown in the table: You must complete the shift into FOURTH (4) to turn off this feature. This helps you get the best possible fuel economy. 2-29