I'm at wits end. Working on my 65 Cuda 273 automatic floor shift. The O-ring for the shift cable was leaking badly. Decided to replace it. Removed the cable and replaced the O-ring. Adjusted the cable as recommended. Filled trans and that's when my problem started. When the shifter was in park, wheels drove forward with the with a lot of clicking (from park cable). As I moved the lever down, the wheels continued to drive forward (No reverse). Decided to drop the pan and set cable to safety neutral switch. Set it perfectly and put it back together. Pretty much the same thing happened. Backed off park cable. In park, wheels drive forward. When I move the shifter down between P/R it is as if it goes into park. Moving it to neutral puts it into drive. I am not a transmission expert by any means. I am hoping someone can understand this and give me some advice. Thank you!