Thinking about getting either a ashcroft air locker or LSD for the rear of my 90 as I believe this would be a better mod than putting a lift kit on, my q is I have disco 24 spline axles front and rear which is fine but I have two spare 10 spline diffs from my old axles, could I have the locker built into the 10 spline diff centres and then fit onto the disco rear axle?
Also how does the Ashcroft LSD rate over any of the others

yes as 10 spline diff carrier wont be used just cw/p and diff case just ensure you specify 24 spline locker or lsd

Ashcroft air locker is about as good as it gets tbh