How long has it been, since you've had the rear gone thru? Most of the time it's caused by the rear being too loose, has too much end play, you can do it, or have it done, but you need it tight enough, that when the side bells are all torqued correctly, it's almost impossible to turn the axle by hand, it needs to be preloaded, so when it gets to operating temps, it isn't moving side to side, if you'll call the manufacturer, they will tell you what the preload should be. The caliper mount, that uses the side bell bolts is the hot ticket, but the preload still needs to be ck'd, often, that's what I found out. Bob!