I had the back wheel bearings replaced and a couple of weeks later the jeep was making a whining noise at the back, took it back to the mechanic and he told me I had done a centre diff bearing. A few days later I was told it wasn't that but the back axles. Apparently the back axel was bent? So I went to pick the car up and was told they put in 2nd hand axels and now I have two different bearings on the back - not happy with this and they are replacing the odd one on Thursday so they are both the same. Couple of questions - is it ok to have 2nd hand axels and has anyone had trouble with after market wheel bearings - they slide down the axel so they don't sit where the old bearing used to sit. Hope this makes sense! Gordo