ok so heres the story, i have a 99 xlt 5.0 with the sport package, and my friend has a 98 xlt 5.0 with a custom dual exhaust and a cold air intake, i beat him in a race (a couple times) and we were both wondering how this happened because he should have won with his exhaust and CAI. the only thing we could think of was that i had 4.10s in mine because i have the sport package, but i checked the door sticker and it says i have 3.73s. i told him that and he said maybe its just wrong and told me to check the tags on the diff cover. i checked the tags and i didnt see anything that looked like it had something to do with gears. so how could i figure this out?