i think it's because the aod lags so much
and you don't have to shift it..it makes up for the power loss
i suppose..good question
i have 4.10's in my aod and love them
this is just a guess, but i assumed it was because the AOD has 3 gears (plus OD), and the t5 has 4 gears (plus OD). so the 3 gears of the AOD aren't as good for acceleration since it spreads the 4 gears accross 3. does that make sense?
It's because the AOD's 1st gear ratio just plain sucks. You should have the AOD-E/4R70W which has a better 1st gear ratio, so a 3.73 may be a better option, especially if it's a daily driver.