chevy camero '87 was reving high but lost acceleration in drive or overdrive?

[susanscrusin2006]

all fine then suddenly noticed no power or acceleration if steped on pedal only 1st or 2nd gears were responding.so limped home on backroads not more than 45 mph. unless punched it then would slip into gear hard after excessive delay. shift-control problem or transmission need replacement totally ? help please