>> The factory option is a Torsen LSD but I am
>> told it is only available to suit a rear axle
>> with disc brakes (i.e. only those cars with
>> ABS), most (all?) non ABS RAVs have rear drums.
Sorry . . . I don't have an answer about installing LSD, but . . . for what it's worth . . .
My 1996 2DR has ABS with rear drums and . . . the LSD option in the US does NOT come with 4 wheel discs . . . so . . . the factory LSD option should be able to be fitted to a NON ABS model.