I was brought my blazer to the shop to have them check a few things and the guy thinks I need new carrier bearings. What is involved in changing these. I assume I need a puller. After I remove the carrier and change the bearings, do my ring and pinion have to be rebalanced or anything. From an earlier post I got the understanding that carrier bearings could be done at home with the proper puller. Also, how much should I expect to pay for a new set of bearings? Thanks.