I have a 64 1/2 coupe that I am going to sell unless I can put an overdrive transmission in it. I have been told that because it is a 64 1/2 the bolt pattern will prohibit me from using an AOD. I was also told that the only option was to use an early 4 spd bellhousing with a T-5 behind it. If anyone could explain the situation I would appreciate it. Thank you.