jturbo

hi ive got a 95 wrx import saloon with the gear box number 827261 6c- ty752vb3fa and on the diff its 314 53 kn51 and that all ok and been like it years so must be right, / now on my wrx import wagon the gear box number is 703006 91- ty752vb3ca and on the rear diff 314 89 kn71 but this car has a funny noise coming from the front of the car, even if you dip the clutch or knock it out of gear it still makes this noise ive been told its been like this a wile is it poss the rear diff isnt the right one for the box if any body can help please,