First of all, Merry Christmas!. Second, I am trying to figure out what the gear ratio of my 60 GMC is. I jacked up that back end, marked the driveshaft, marked the wheel. Here is where I am confused, for every full rotation of the wheel, the driveshaft rotates twice. I thought the driveshaft should rotate close to four times for a 3.90 or 4.10 ratio. Am I doing something wrong? Another thing, if only one wheel rotates at a time, do I have limited slip? I thought that if one rotates one way, and the other wheel goes the other way, that means you don't have limited slip. Is that true? Thanks!
