anyone running 5s or 6s in a 3905 emaxx with stock diffs?

[blueb8llz]

is this possible or will the diffs have no chance? right now, i have a mmm/7xl gps at 47.8 mph with no probs.
but ever since i geared it so high, i lost my intial torque power. so now, i want more power, and a bit more speed as well. if i was to run 6s (with a new motor of course)geared for 55mph, and take it lightly on the take offs, will the stock diffs do fine?
what actaully causes the diffs to break anyways...wheelies or full throttle on stand stills? if i was already going like 20mph and then i wot, will that ruin the diffs too?