Is the transmission from a 1988 Chevy cavalier with 2.2 l interchangeable 1991 Pontiac sunfire?

No, the transmissions are not directly interchangeable between a 1988 Chevy Cavalier with a 2.2L engine and a 1991 Pontiac Sunfire with a 2.2L engine. While both cars used 2.2L engines, the transmissions changed over the years and between different GM platforms. The mounting points, bellhousing patterns, and even the internal components might be different enough to prevent a direct swap. You'd likely run into significant incompatibility issues.