Anyone know the specs (thread pitch, size) of the rear axle nut?

[Mr.Woolery]

I'm interested in putting an extra nut on the rear axle to act as a jamb nut.

I know that the rear axle nut is a 30mm nut, but I don't know the thread size or pitch for the nut.  I also know that it's the same size as the '90 Ford Taurus front axle (thanks MadMaxedAtom for that info).  However, I can't get the nut at the local Ford dealership because they said they don't offer parts for that model anymore.  Does anyone happen to have the full specs so I can buy one elsewhere? 

[bolus]

pm spanky, he is using a jam nut

[Mr.Woolery]

Awesome, thanks!