had a b44 and now 2010 specs (sorry not the kit involved) but comparing the Diff and the geared, the 410 is less troublesome (just change the Xring and all will be ok with a Kyosho o Ring 5), as compared with the ball diff. the Main gear for the B44 is prone to striping (if not properly shimmed), as for the 410 just read thru some build threads and some info on the output shaft bearing wobble, then i think you are worry free till you change gear oils.
cheers!!!
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