Trying to find out why rear is heating up. I go for long drive and rear end gets so hot you can not touch it. I pulled cover off and can't seem to find out anything. The pattern looks ok . but don't no exactly whats is the best. Seems like ring gear pattern looks straight acoss gear except it does not go from one edge to the other. looks deep enought but the pattern stops about 1/8 inch from one edge. How hot should it get??