This is a pretty old post, but it doesn't look like you got very complete advice. Did you get your problem figured out? If not, it sounds to me like your drive bellows failed. The milky oil is probably from your drive. Your problem has gotten bigger than simply replacing your drive / ujoint bellows.
You will probably have to replace the primary drive shaft bearings and ujoints. This is a medium to big job. There are many posts on here on how to fix it. Many will say that you need to pull the engine to do this.
Since you have milky oil, that means the seals for your upper gear assembly have failed, and the assembly will need to be rebuilt.