1965 A904 servos

Hi all!

My '65 Valiant has gotten so that when it's cold, going into reverse takes a little bit of time. From what I understand, it needs the reverse servo replaced. I will start it, put it in neutral for a few seconds to get the fluid flowing, and then put it in reverse and that takes care of it.
I have read that there are upgraded servos for the A904, but maybe they are only for '67 and up? I have done some searching on the forum and haven't come across the information I am looking for. Are there upgraded servos available for the earlier cars? My car is just a stock slant six. I am thinking that I should probably just do them all while I am in there. Where do people suggest I buy them? Links are appreciated!

Thanks so much!

Chad
Try it in drive but don't hang around in neutral. If it does it in D as well, it is a converter drainback issue. Many Torqueflites do that.