Is the GM 3T40 automatic trans axle in a 1993 Corsica and if not what?

The 1993 Chevrolet Corsica did *not* use a GM 3T40 automatic transaxle. The 3T40 is a transaxle used in some smaller, front-wheel-drive GM vehicles, but not the Corsica of that year.

The 1993 Corsica used either a GM 3L30 or a GM 4L30-E automatic transmission, depending on the engine and trim level. The 3L30 is a 3-speed automatic, and the 4L30-E is a 4-speed automatic. These are *transmissions*, not transaxles; the engine and transmission are separate units.