Hey Guys,
I just combed through the 1990-1995 Ford Master Parts Catalog, the only mention of Econoline is 1990 1991 1992 1993, stripped chassis only, which Im thinking is motor home, and step van, the ZF 5 speed and to my suprise the T18 are the only trannies mentioned. But only in the trans parts like shift tower. When you browse the 7000s numbers (manual transmission parts and related), for clutch master cylinder, pedal assemblies and so on, there is no mention of econoline at all.
So my guess is that the ones rolling around, as Mr Roboto has added are home grown tomatoes or where custom aftermarket built. For example, I had a customer in the 90s who drove an E350 that had a 5.9L with a 5 speed, dont know whos trans it was, I never got work on it, just all the other garbage he owned. He took it to Colombus,Indiana, dropped it off, and picked it up a week later. He orderd the van, had it converted (camper), it was extended, filled it up with the family, hooked up the trailer and after one vacation he was ready for a motor swap. He ordered it with the 7.3L IDI NA. Talk about throwing money around. He puts people under for a living, must pay well?
So there you have it, the most I can come up with!