Originally posted by pheyhoe
whats the deal with these big ring diffs? i have a carpet knife v3 and i assume it has the standard on on because the balls are in the spur gear inner holes... what advantages do the big rings have and why dont any cars come with it as standard?
Back in the day, all diffs were big ring diffs. AE introduced the "stealth" diff with the 12L3. The idea was to reduce rotating weight. The downside is that the smaller rings are more fragile and with fewer balls, the diff is not as smooth. A smooth diff is crucial in a 1/12 scale car.