Alex_86, to be fair what they say does makes sense, a 3i box because it has no LSD is under a lot less stress because it can transmit all the power through one wheel, where as an LSD box will always drive both wheels.

But looking at realistically, ALL BC type boxes are weak as fuck, the geared differentials are SO common to break up and drop out, and they are just in general a very weak gearbox.

The LSD box is the most common to fail but thats probably because its the only box worthy of fitting to a high power car..........