New dart bad tranny in pa

Bands are not applied in direct, so adjustment not likely to do any good. Direct clutch is used for reverse as well as high gear...... hows it work in reverse??
It does go in reverse I haven't backed it up enough times to tell if it slips. I can try that and let you know. I gave found some good a904 tranny's on market place. Does it hurt a tranny to set for a long time if it was good when parked? Can I just freshen it up without getting into the guts of it? Thanks for the reply Lefy71!