i have an 09 5.7 and it is not on the window sticker. if you crawl unnder the truck there is a sticker on the axle by the passenger side rear tire that has it on it

 

i checked several of my dealer's stickers online... the only ones that specified ratios were the 3.21s or the 4wds with 3.92. My guess is default (3.55) is not specified, but ain't certain. Wasn't looking at non-hemis though.

 

On this topic what are Corporate LD 9.25 rear end? and 208mmHD front axle

 

My truck has the 3.55 gears and it states so almost at the very begining of the window sticker in the top left column under standard options.