Gearbox failure

[miles]

Everyone has there ways, I know AB motorsport used a larger bearing on the input shaft end which some BTCC box's did but as WP said the gap then between the 2 bearings in the end case got so close it cracked, well on the BTCC ones, you even need to watch when fitting a single plate Race clutch the clutch arm top bearing area can fail as well due to the extra load on it.
Old race box's I did used Roller bearings instead of the bush's which these days for some reason seems all to be forgotten about