Since the '68 Travelall has a remote tcase, I'm thinking an o/d added to the bw auto I'm putting in (along with the 304 from the '66 Travelall I'm parting) would be a good idea, considering the low gears.
An old school overdrive assembly is going to be next to impossible to locate for a borg warner automatic transmission. In fact, locating an entire correct (not a Ford fmx) builder kit for one of those units is near impossible today.
Any idea which model it is? M11? M12? I have a lot of amc and Jeep buddies, so finding the parts is easier than figuring out which trans is in there for me. (I'm a napa parts guy by trade)