The heads flow differently in 05 and 06 vs 07+.. perhaps they realized less timing (on a stock setup) could be achieved with the higher flow of the B25 heads...?
go to the dealer and buy 5 qts of ATF-HP for the tranny. its 5eat atf, the 4eat tranny uses diff fluid so make sure it says HP on the bottle(silver bottles). diff fluid is 70w-90, i use mobil 1 or valvoline, really anything thats GL-5 rated is fine.
diff fluid is its own compartment and so is atf fluid. you fill atf through the tranny dipstick tube. use a funnel with a long flex tube. it might take a while but thats how you fill the tranny. no other way.