Torqueflite 904 - gear selector issues

Torqueflite 904, recently rebuilt, was having zero issues shifting between park, R N D. I had to replace neutral safety switch because it was leaking, as well as the seal where the selecter cable enters the transmission. Everything is back together and so far not leaking, but I'm noticing that I can go park -> reverse -> neutral -> drive just fine, but I'm having issues going backwards. I can get it into park but I cant shift from drive to neutral or even reverse, I have to go to park then back down to reverse. Not sure where to start on this.