Hi, I have just had the same gearbox 'whine' issue resolved. I purchased my KX-R AWD from Narellan Toyota in Jan 2011 and have covered 55k. The service dept initially said the couldn't hear the noise so I took them out for a drive and this time they noticed it! Well 4 days later and the car has had the final drive pinion replaced and all is fixed. From what Terry Shields Parrammatta say, this is a modified part, so the noise should not re appear. I'll wait and see on that one. Can't really complain about the service dept at Narellan, didn't try and fob me off and they supplied a courtesy car.