When I got the 2.59s swapped for 3.54s they pretty much told me to go easy for the first few hundred, then after about 500 or so you should drain the gear oil and replace it. At that time check for any larger metal deposits. There shouldn't be any.
One article I read and followed had a first 50-100 mile breakin procedure. Drive the car for about 10-15mi. Stop and let it cool down for an hour or so. Do this again a couple of more times. Their point was that the first few times the car is driven the gears are going to heat up to normal temps but they have never been there before. So the heat/cool process helps the metal set. I did it and then took it really easy on the car for about 300 miles. Then got on it a little during the next 300. Then changed the gear oil. Maybe a little overkill but my gears are happy and no metal shavings in the oil.
After your breakin is done. Kick off the ASR. And nail it. And hold it through the 1st-2nd gear shift. Hang on. The a$$ end may try to pass the front end, you'll love it :J