91 Regal Shifting Issue
 

Hey, I have a 1991 Regal with the 3.8 engine, I'm having a issue with the transmission shifting that I was hoping someone could help me with, The issue is that it seems to have a problem shifting when it gets to 50mph, I can shift manually from first to seccond, but if I shift into Drive or OD before 50mph the transmission acts like its in Neutral, it just revs freely. Now if i drive in seccond until im exactly at 50mph and shift into OD the trans. Goes into OD and drives fine, but if i give it gas it will shift from OD back to drive like it should, if i give it more gas to the point the transmission needs to shift from drive to 2nd, the trans, acts like its in neutral again untill i let off of the gas and go back to OD. Im hoping this is a sensor, the trans doesent slip in any gears and seems strong...Any Ideas???