Here's the skinny on why in the PAST you'd want the 4.10 for auto and 3.73 for manual.
In the past when the Manuals were 5 gears and the autos were 4 gears you would need the 4.10 to help kick you the car in the butt because the gears were spread out further in the auto.
These days, that's not the issue and in fact a 4.10 gear in an auto is really ridiculous. The fact is that the 1st gear in the Auto is actually shorter than that of the manual. Why? to give it the same oomph off the line as 5 spd manual by making up some of the added drive train loss. Thus both the 5spd auto and manual, all things being equal, will reach 0-60mph at the same time and post within a hair of each other in the 1/4
Below is the break down for the 5sp manual and auto tranny gears.
Manual \\\ Automatic 5RSS
1st Gear 3.750:1 \\\ 1st Gear 3.250:1
2nd Gear 2.190:1 \\\ 2nd Gear 2.440:1
3rd Gear 1.410:1 \\\ 3rd Gear 1.550:1
4th Gear 1.000:1 \\\ 4th Gear 1.000:1
5th Gear 0.720:1 \\\ 5th Gear 0.750:1
Reverse 3.150:1 \\\ Reverse 3.070:1
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