my 2 cents worth.
Manual maybe...but if you live in a semi rural or rural area (Pakenenham isnt either these days) go the 3.25..far more flexible and driveline friendly.
For a basically stock auto box car they are too low.
I fitted a 3.71 to my 09 VE auto SS ute.(224 rwkw)
Brand new, took it out afer 2000km.
The auto gives no room for the drive line to get over the very low gears, the very high traction and an auto will break the lsd in no time..or rather not break it as sch, it just wont work. Can assure you also that while faster to 120, a 3,25 will work far better and more eficiently across the performance range and will not run out of puff like the 3.71 (in a factory stock SS )
Dont get me wrong, they are great fun and really launch hard around town, but fuel suffers hugely (not that it matters) the drive line is worked so much harder you wont believe it, and you MUST get a Harrop Tru-Trac or similar fitted. the OE lsd just isnt up to the task...that TruTrac adds a whole heap of cost.
Strongly suggest you go 3.25 mate.