Need help. strange sound leaving me without a car

[cfletch13]

One morning as i was getting on the freeway everything was fine but once i hit 5th gear and about 65 mph the right rear end started to make a strange clunking type of noise. i immediately got off of the freeway and pulled over. Wasnt sure what was up i slowly got it back home and the noise was constant anywhere above say 20mph. the sound goes along with the speed (slower i go slower it clunks fast i go the faster it clunks) so that very day i took it over to the shop and asked them what it could be. I was thinking a CV joint because my car is at 230k. The next day the shop rings up and he said there was metal in the bottom of the diff and he thinks i broke a tooth off somewhere in the diff. Which is strange because i just recently had the cars fluids changed and the diff was completely fine. I took it home today and under power i did not hear the noise but if i am just cruising then i will hear it. Again the sound is coming the right rear. I am going to get a 2nd diagnosis but i want to hear what you all think this could be. Thank you

[anarekist]

uh, if you have metal inside your diff then something is amiss.

[cfletch13]

Even with the recent service saying that everything was good? could this guy just be messing with me to get more money for a diff install?

[CMG]

What does the revent service have to do with anything. U broke it after that