not shifting. only in and out of park on 1995 Ford Taurus

I was told had a vac leak and needed to change o2 sensors. It's a rebuilt transmission fluid is clear . What could be the problem

Asked by for the 1995 Ford Taurus
1 answer
For clarification, it won't shift into drive and reverse or it doesn't drive through the gears ? Does the gearshift feel bound or loose by chance ?