okay i picked up a van 14ff from my pickandpull yesterday. $86. i know how to tell from the #'s on the ring what ratio i have but i have never heard of this ratio or i for got how to read the #'s. it reads 1 GM 464917 12 45 6 80 so you take 45/12=3.9 hu i have never heard of a 3.90 gear ratio. i this right?