stronger gerboxes or dd-outrunner in ax10 clone?

[speedy]

I mounted a 35x48 outrunner in the gerabox in my hsp pangolin (ax10 clone)
and after 2 min runtime onewheel got stuck an i bliped the trottle and CRUNCH" and the top two geras inside the cenrer gearbox stripped out :(
are there any bulitproof gearboxes that would fit ?
the center driveaxles are traxxasstyle telescope shafts made for 5mm output shafts.

i think that the most durable sulution would be a outrunner in direktdrive
i have a bigger motor 42x50 850kv ,with 5mm shaft would this bee enough ?

this is an 2.2 crawler