What is the best way to get an overdrive auto in a 67 Barracuda?

The 700R4 is just like the 2004R in that it can be used without a computer if you use a non lock up torque converter. My 2004R (in my Barracuda) uses a non lock up converter so I can just drive it like a regular car and the trans makes all the shifts on its' own. Yes, I lose 1 - 2 miles per gallon because the 5th gear (converter lock up) doesn't function but it makes it so easy to drive and less electrical to hook up. The 700R4 that I have in my son's '46 Chevy also uses a non lock up converter (no computer or wiring). He drives his car everyday with no issues as well.

Treblig