Can a 1989 Chevy truck automatic transmission fit on 1997 Cheyenne truck?

No, a 1989 Chevy truck automatic transmission is highly unlikely to fit a 1997 Chevy Cheyenne. While both are Chevy trucks, there were significant changes in transmission design and mounting points between those years. The bolt patterns, bellhousing, and even the overall size and internal components would likely be incompatible. You'd be facing major modifications, if any were even possible, and it wouldn't be a practical swap. You'd be far better off sourcing a transmission specifically designed for the 1997 Cheyenne.