Thanks everyone for the input.
I'm going to check today, but right now I believe it has shorter, higher numbers, torquey, whatever nomenclature, in the differential paired with the TH400 3-speed with a 1:1 3rd gear as drive. The van does not have a tach, all I know is that it is howling at 65 and I'd like it to be running at about 2100rpm in drive if I could.
Someone mentioned elsewhere that another viable option would be to, all other things being as predicted right now, to put a 700r4 4 speed into the van instead. I really really like the idea of a 30% OD gear, but what I really want to do is make sure everything makes sense. I want to make sure that I'm not going to spend 2x as much and turn this into a massive project just to have 4 speeds instead of 3. That being said, If I had a 4 speed, it would probably retain a lot of its towing power, while still having highway/economy capability, and I'm assuming I wouldn't have to lengthen the gears in the diff so aggressively. I assume that even if I did get a 700r4 in there, I would want to change out the diff gears anyway to get the ratios right for what I'm trying to accomplish.
Sorry for all the postulation I will get all the ID's and pictures I can today.