2003 A4 Avant 1.9 TDI 130 Has developed a whining noise with pitch related to road speed. It's been diagnose as the diff bearings. I've been quoted 475 for the diff rebuild and about 300 for dropping the box out and sending it to the specialist for the rebuild. This is a small independant garage which has always been OK in the past. Is this price taking the 'P'. Are there any alternatives - how much would a recon box cost ? I'm in Northwest UK - Lancaster district, but regularly travel to Accrington area if anyone knows any alternative, recommended garages for a quote. Also how urgent is the repair. Thanks for any advice Martin.