Not only did I not get a reply to my post, I see there's a check mark opposite my post title.
What does this mean?
Anyway, I failed to say this is a 3.3 and that I was only able to take the van to my house and get it up on ramps long enough for a quick look underneath, add enough ATF-4 to test drive it properly, get the tires pumped up, test the lights. etc., thanks to the seller being agreeable to my doing this. Even in that short span of time I should have been able to see a coating of ATF all over the place that would have been consistent with a major leak. So that mystery was what prompted my post.
I did (I think) answer my own question about rpms at speed, based on some Gen II specs that show 2080 rpm per mile. So I assume the Gen III specs would be similar.