automatic rear diff
 

i have a 1995 wrx auto the box code is tz102yb3ba-ge,i would idealy like to know what rear diff it runs with as im going to be converting it to manual soon and was hopeing i could find a box that will ,match the rear diff. so if any1 could give me the diff no 3.9,4.11 etc that would be fantastic,thanks rob.