What type of transmission fluid for 1993 corvette 6 speed and is the overdrive a different type?
The 1993 Corvette with a 6-speed manual transmission uses SAE 75W-90 GL-4 gear oil. There is no separate overdrive; the 6-speed is a single transmission with all gears using the same lubricant. Make sure to use a GL-4 rated gear oil; GL-5 is *not* recommended as it can damage the synchromesh components.