I found I had rebuilt mine to tight once. The screws that hold the diff halves on can easilly be tightend up to much.
Best way to check this I have found is to build your diff, but don;t screw up the screws very very tight. Push down on the casing, then tighten the screws until they hold the casing on. thorougly clean the case of any oil. Now leave it for 15 minutes resting on one side. Check after if there is any oil seapage. If none turn over and rest for 15 mins on the other side. If there is then nip the screws up about a 1/4 turn, clean and rest again. After a while you will get used to how tight the screws go to so it will cut down the intial time of rebuild. You may still get a bit of oil come out in use, but don't forget your spining the diff at high RPM...it's inevitable with pretty much any diff it will seep some oil.
you will also notice that the gears sit together better and aren't as tight.
Hope that helps.
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