Ok, something has definately gone on my RS, its either the gearbox of the diff, haven't had a chance to get under it yet and find out which one it is! Now, after a blow like this, shall i just go ahead and change both no matter what it is that has actually gone? And also, is it wise to put a diesel box in it this time? Any info on the good and bad points of the diesel box idea would be appreciated?!

Cheers