99 2.2 3spd auto NO REVERSE

I have a 99 2.2 3 spd auto. Here's my problem when you put the car into reverse it sounds like it is engaging but when you press the accelerator it just revs, Also another thing I discovered was that while the car is in neutral you CAN'T push it backwards, And to roll it forward you have to rock it back and forth even for that . I have changed the fluid and filter. The fluid wasn't burnt and it was still very new looking there weren't any metal shavings. Please give me some ideas on what it could be