Rear End Instructions???Help

I have a 98 A4 Trans Am , and i need to add posi additive, gear lub(oil) , and of course put a new gasket on. I was wondering does anyone have any directions or instructions i could follow to do this job
thanks for any help

This is all I could find on a quick search.
Directions for a gear install....

Seems pretty straight forward for what you are doing though.
Use GM rearend additive. And a good fluid.
http://www.geocities.com/MotorCity/Downs/4013/re.html