Paul I don't have the servo-activated HICAS. I have the straight lock bar that Warwick specifies. And on the subframe bushes, while the URL I gave above suggests that you can leave the old bushes in an fit stiffening ally collars over them, I think I will be leaving those as well for a while. I am certainly not removing the subframe after just changing the diff!
I am not pleased with the lower mount arrangement for the rear shockie, however.
