My '68 Bird has a 200R4 behind the 350HO motor and I have a manual switch to switch it into and out of overdrive. I have been having issues with it not wanting to switch out of O/D once it heats up. When I start out, the trans shifts exactly as I want and shifts into and out of O/D no problem. Once I have run the car for a bit, it doesn't want to switch out of O/D. I have double checked the geometry of the TV cable on the carb and the switch seems to be operating fine. I was hoping someone might have some thoughts on what might be causing my problem.
