Speedo Gear?

I finally got tired of wondering if my speedo was correct or not so i paced one of my friends last night and we were lined up perfect his speedo said he was going 70 and mine said 80, so i definentely need the correct speedo gear but i don't know which one. (The car came with gears already installed but i don't know which they are). Do you guys know which gear i need?

Let me know, Thanks
 
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Look on the sticker on the inside of the door and read the axel code. Tell us what letter it is. That will be a starting point. What gears did you install, 3.73's?