geared diff
 

hey lads just wondering if a b4 geared diff will fit into a x6sq gearbox

No it won't.

Xfactory aren't planning on making a gearbox to fit it as far as I know either.
If you search a bit there is a thread on this that I started where Xfactory answered a while back.

Don't really see the point at the moment as the steel outputs of the geared diff aren't really up to brushless modified power. In a B4 driven sharpishly on Astro they last about 2-3 races...

If the gear diff were any good we'd think about it, thought it would require a whole new trans case mold -- second most expensive on the car.

But it's not, so we won't.