Where is the lower transmission inspection cover on a 97 Chevy s10?

The 1997 Chevy S10's lower transmission inspection cover isn't a single, easily identifiable piece like a dipstick tube. Instead, access to the lower transmission is usually gained by removing the transmission pan itself. There isn't a separate cover specifically for inspection.

To check the transmission fluid level (which is often what an inspection entails), you'll need to locate the transmission pan, which is situated at the bottom of the transmission. It's typically a fairly large, rectangular or slightly curved metal pan bolted to the transmission. You'll need to remove the pan to check the fluid and the filter (which should be changed at the same time).