T5 go with the 4.10's
AOD go with the 4.30's
First gear is short with the 4.10's, but its still plenty useful and the torque multiplication is awesome. If you've got some drag radials, folks will be lookin' at your tail lights. I wasted my time going to 3.55's before the 4.10's and it was exactly that...wasted time and money.
With the AOD, first gear is only 2.40 so I wouldn't (and haven't) go with anything less than 4.30's. I may even find myself going with some 4.56's when its all said and done.
Been there, done that, learned my lesson.
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Jeff Chambers
T/S #3
11.97 Seconds/114.5 MPH
Chambers Racing Team