9'' is an rs 500 diff i think. Rod use,s a daimler limo diff think thats a 10.5'' but u would have to pm him about beam / flange and sharft mods thats the cheap option!. If u go ford 9'' there mega money so u may as well go gripper or quaife with a uprated cwp good for 500lb ft un less u drive like a twat all the time