the new tranny fits all the trucks for the electrics, it is brushless ready with all metal gears and three pad slipper. i'm betting that it would fit your revo chassis but never had one side by side.
my new e-maxx and summit have the same tranny housing.
i put two 775 motors on my summit and never had trouble with tranny gears.
http://www.rctech.net/forum/monster-...75-titans.html