the v6 box uses exactly the same ratios as a cossie box, only the bell housings are different, same diffs in 2.9v6 aswell

my gearbox in mine has done well and that gets abuse now and then

i used to go through a gearbox each month on greens on my last one

this one is a higher spec engine but witha hydraulic clutch which i thinks helps loads better have never destroyed a diff yet either and only snapped 1 shaft