Sorry, my post wasn't at all clear.
The driveshaft is leaking from the seal, but I know that's a relatively easy fix. Going to get that done ASAP.
There's a noise coming from the gearbox, and the transmission place said it's probably the diff. In a FWD U13 SSS, is the diff servicable? As I said, I thought it was a sealed unit, not ment to be fixed/repaired etc.