If my rear end is worn and in need of a rebuild to my understanding it will act as if it is an open diff meaning if I jack up the rear and rotate one wheel the opposite wheel will rotate in the opposite direction. If this is the case do I calculate the rear gear ratio like an open diff at this point or like a typical LSD. Problem is the person I bought my car from told me the rear was a LSD with 4.56 gears so I jacked the rear of the car up and rotated a wheel and counted the driveshaft revolutions and it spun roughly 4.5 times but it is possible it has always been an open diff and that would mean my method is inaccurate considering how an open diff works. I know this is confusing but I can save a boat load of time if this is a real 4.56 rear that's just work out.
Thanks in advance.
Thanks in advance.