No diff tag, so I need to know what this is

[redsubdivisions]

Purchased an LSD from a guy that used to be on the forums. I've confirmed that it's locking, so we can pass that part. He claims it's a 4.10, but I used to have a 4.10 open on my sedan and then I switched it out to a 2.93 LSD for a while, and now I got this diff. When I threw it in, it didn't seem like my old 4.10. I am able to get a general figure of what the diff is (3.46, 3.73, or maybe even 3.25) by calculating my road speed with stocker 14's. For instance, 5th gear is 80 MPH at 3K. Anyone have an idea on what it could be? I've heard you can spin a wheel one full rotation and see how many rotations the driveshaft makes and that is your differential ratio, but I have yet to test that.

[devon.818]

then jack up the rear and test it....derp?

[redsubdivisions]

This is going to turn into a rage guy comic. I would but I'm at work right now. lol