I have run my 210 with Diff in for 3 meetings now and no issues what so ever. 1 side of the diff-There is a tad bit of plastic that is on the end of the gear. So the diff needs to be shimmed a tad more on 1 side to move it away from the gears so it rolls free on the gears. So the slight bit does not hit the gearbox gears at all. If that is done correctly, then there is no issues. But someone I know had a similar issue, which I think was that exact reason. The main Gear diff body side, needs to be shimmed away as where the body and gear area meet. The body overlaps slightly-Which will cause binding and noise if not shimmed correctly.
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