Yes mine was notchy in my hand the first time and also in the gearbox. It was fine after a run or two. Also each time I have rebuilt it with new oil the diff will feel fine in my hand (having been run) but still notchy in the gearbox until I give it a run and the diff seats again with the idle gears such is the fine mesh between all the gears. Just make sure there are no big notchy bits when turning the spur/outdrives when the gearbox is in the hand. sometimes it takes me 3 or 4 attempts to put it all back in the gearbox and have it feel someway smooth prior to a run.
One last point. I race on Astro with some sand, and you do need to go round every gear and remove any small traces of sand grains to stop it from feeling even worse. the mesh is sooooo tight you cant even have the smallest of blemishes in any of the gears
HTH
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