How do you take out the rear axle gear out of the casing do you need a special tool for it does any one have a diagram?

Answer

You'll more than likely need to pop the axles out, remove the drive shaft. Remove the nut on the rear yoke and remove the rear yoke (puller). Than you can remove the rear differential by unbolting it behind the cover.

this is very dellicate if you dont know what your doing dont do it, this is one of those things to take to a shop cause you can more damage trying to fix it