Actually, just found this:
Quote:
Originally Posted by smcurro
An easier way to figure out the ratio is if the axle is a posi turn the axle one full rotation and count the rotation of the pinion. If the differential is open then fix one side of the axle in place and turn the other side two full rotations again counting the rotation of the pinion. If the pinion turns three and a half rotations, your gears are 3.50 to 1. This is much easier than taking things apart.
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Quote:
Originally Posted by joe_padavano
Unfortunately, it can sometimes be difficult to tell the difference between 3.23 turns, 3.31 turns. and 3.42 turns. I turn the pinion until the axle shaft turns ten times. It's much easier to tell the difference between 32.3, 33.1, and 34.2, for example.
As for available ratios, it could have been anything between 2.73:1 and 5.00:1.
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So I think I'm ok.