[TexasSP]

Keep in mind that if you look into the final drive ratios 25:1 and 75:1 you will see that they coordinate almost perfectly to the stock 3905maxx/erevo tranny with the standard gears and the wide ratio 1st gear set. The tranny/gears are well proven to handle brushless just fine.

I am sure that the diffs are based off the highly successful diffs in the e-maxx and e-revo so I really wouldn't worry there. I have had no diff issues in either my 3905 maxx or my erevo.