Coming up for 150k on my 2001 A4 2.5 TDI quattro sport avant (AKN engine). Since Easter there had been a rumble noise from the rear that increases with speed. So far I've replaced the rear wheel bearing (passenger side), checked rear diff fluid level which is fine, fitted two new rear tyres, and have just fitted Brembo discs and pads all round. Two different garages thought it could be the rear discs or rear wheels as they were due for replacement. When I replaced the rear discs (passenger side) I noticed there was a little grease weep on the outer CV joint (steel band). I replaced the reluctor ring on this drive shaft a couple of years ago. The rubber boot is not torn. Got me thinking that this joint could be either running dry or is simply worn out. Are rear outer CV joints worth re-packing, or just replace it? The Ebay part looks like £30, and I'm tempted, but would rather go for OE quality, but the mounting cost of replacement parts is driving me nuts. Is it worth re-packing the joint first? Any suggestions?