I've blown the front diff (and a hub at the same time :doh:) on my 1989 defender, its coil sprung and has 10 spline diffs. I have a Disco 24 spline front axle. are the ratios the same on the 24 and 10? I'm gonna change the rear axle as well for a 24 spline but can't do the rear for a few weeks.