I think that we've gone through this issue of x vs 4runn....both is of the same 4wheel capability but if the runner's got the rear lsd then it'll do a bit better than a open diff X but the stock lsd for the x sucks a bit.....but you basically paid for the better lsd> 4runn=lots of $$$$ compared to the X....I'd rather save the extra $$ and get lockers instead of paying way more for a toyo lsd