Ford Repair: Gears, torque specs, torque wrench

Question
how do I change gears in rear end?I have a set I bought and I wanted to install myself.

Answer
this is not something i want to explain over computor-one mistake and you have ruined a set of gears and possibly housing-settings are very important and you need dial indicator to check backlash-torque wrench to set preload if you still want to do it buy a manual and follow it step by step including torque specs.