Gear ratio ???

[NeroSnake]

I just bought a used 05, so there is no dealer invoice.
How can I tell what rear axle gear ratio came with the car?

Thanks

 

[bigcat]

in 05, if it was a manual, it had 3.55s. the autos came with 3.31s. if the previous owner changed gears, you will have to calculate it. you can rotate the driveshaft and the tire. the # of rotations (approx.) is the ratio.

 

[NeroSnake]

Thanks BigCat. Its a manual, 3.55 s are what I suspected, it seems to get the revs up quicker than what I've had before, but I wasn't sure if it was an option.