Wish I could help, but sounds like you've done more research on E-series than anyone I know..
The lowest first gear ratio is 3.833 in the E57F5 gear box from the COROLLA AE95 4WD WAGON.
Toyota E transmission - Wikipedia, the free encyclopedia
I have no idea about interchangeability though..
this might help..
The Toyota gearbox thread. - Mazda MX6 Forums: MX6 Forum
Toyota E58 gearbox install into my turbo GC Part 1 of lots - Mazda MX6 Forums: MX6 Forum
I was asking some similar questions myself:
http://www.toymods.org.au/forums/tec...-stronger.html
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