There have been some problems with AE diffs of late. It cost Ellis the win at the last race.
Check that the two diff bearings fit properly into the outdrive and gear. It should "float" easily into the outdrive, not "pop." And it should press smoothly and easily into the gear, again with no "pop." If you must apply any pressure at all to get the bearings in, relieve the hole where they go. Don't let either one become sloppy -- it's a bearing and it must fit properly -- but these are small bearings and it doesn't take much to deform the outer race. Premature and uneven wear can easily be the result.
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