Could anyone tell me if a rr axle has a different diff ratio to a 1988 90. i have searched the forums and although there is lots of info about disco axles I cant find any for a RR. I have a 1988 90 with a very leaky rear diff casing bought front and back axles from a rr but new to this so do not understand if I have to change the diifs from the old axle or not. intending to only change the back but the front one does have vented discs so will it brake better?