quick-n-dirty way to check:
-jack up one of the rear tires
-put trans in neutral
-rotate tire around exactly twice while counting the number of times the driveshaft rotates
-if the driveshaft rotates 3 and a half times, it'll be 3.55... if it's just over 4 times: 4.10... etc.
if the rear axle has a posi, you'll need to jack up both rear tires and then rotate only once around.
:thumbsup: