Thats funny!
Sorry, but I laughed....
If you simply torqued the nut to 25 inch pounds, then you have to tear it back down.
Once you get an actual rotating torque on it, its going to change the contact pattern of the gear teeth. (since you should have a new crush sleeve in it) The pinion contact pattern is going to move toward the front of the car. ("outer edge of the teeth")
http://www.differentials.com/install.html
Thats a site with some good info..