I'm the guy who put that hole in -- nobody else on the design team had thought of it. I was tired of wrecking perfectly good bearings trying to get them out of "normal" tranny cases. Had to stick a screw driver inside the inner race and work the bearing up out of the case -- ugly. Bearing in a blind hole is always a bad idea.
Up here in northern Ohio we run all summer on dusty clay outdoor tracks. Tracks so dusty we put water on them frequently, often every 5 minutes after every race. We have literally never had an issue with dust in an X - 6 transmission.
B.T.W., I'm not criticising -- I assume what you are saying is true. Amazing to me.
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