one in one gear
 

Does any one know what gear is the one in one gear on a o2 wrx? One more question what is the power transfer ratio from front to back? Thanks.

This:
US Impreza WRX MY02 TY754VN2AA 3.454 1.947 1.366 0.972 0.738 3.333 1.100 3.900 Viscous (4kgf) Open Rev. pop-out addressed 10/01 (main shaft, rev. idler, rev. hub)

is from here:
[url]https://www.i-club.com/forums/showthread.php?t=91788&highlight=gear+ratios+stock[/url]

So it looks like 4th is the closest to 1:1 (0.972). That's true for most 5 speeds. Also, a question like the one you asked is one that you want to try using the search feature for before you ask.