5 speed ETC-i and I wouldn't put more than twice the stock numbers through it. I'm not sure how much power they can handle, so I'd be weary to put more than a TRD supercharger could put out.
Its either A750E or A750F. I'm not sure since yours is a V6 and updated. I know my 03 V8 is A750E (V8) and 2WD. And when Toyota added a V6 in 2005, they used the trans for the V8. So I'm sure its the same, if any of that mumbo jombo made any sense.