Yea, I'm not say that they aren't. I just meant that the main difference between the stock Maxx diffs and the Revo diffs are that the stock Revo diffs are sealed.

oh...i didn't know that squee...i knew the maxx stocks were not sealed...

Yup. The stock Revo diffs are sealed. Thats one MAJOR advantage when racing....

The x-rings seem to wear pretty quick.. Isn't there an O-ring replacement for them?

Not sure...I think a standard O-ring of the same size might work...