we routinely tune E-series vans with either our custom tuned TS chips, or the HydraChip...
I didn't check your location prior to replying...but shipping an axle is probably going to be cost prohibitive....I'd search craiglist/ebay/google around, etc...but we do have customers with E-series 4WD conversions...
05+ obviously have the coil sprung front end...which will make for a nice ride...any 99+ D60 Front axle can be made to fit...it's just time/money