There might be something to the tranny issue.Of coarse the tranny must have been on its last leg anyways. Looking at the smog papers I just got.They performed a 15mph and a 25mph, I remember hearing my van reving but was talking to the other guy so didn't really pay any attention.Anyways heres the what I just noticed,

15mph at 1433rpm
25mph at 1397rpm

And they hold it there for a while.
I'd have to crunch some numbers but I'm thinking that the 15mph test was done in first gear?

vince