At 37,321 mine are toast. I started hearing a squeak last week not knowing what it was. Started getting some vibration and growling today and new what it was then. U-joint on rear driveshaft at differential has two blown seals and sqeaks real bad. Front u-joint on rear driveshaft is covered in gray dust. It's got to be bearing dust. Anyway, I talked to the service manager today and they will replace them under warranty with the $100 deductible. I really would like to have better u-joints than these and also would like to be able to grease them. Anyone have any information on replacement u-joints? Thanks!