My son drives the car. There was no problem prior, other then sometimes it seemd to delay shifting from 1st to 2nd when cold. He called me from work and said he couldn't back out of his parking space as it acted like nuetral in when he put it in reverse. I told him to push it back and drive it home. He did that, but said it would not shift to high gear and rpms were higher of course, so he drove home slowly the back way. I just started the car and reverse now works! Could it be a clogged filter? I havn't touched it since the torque converter repair, and I assume the trans shop replaced the filter at that time, but I don't know for sure.