I ran these truck for many years. The 1.0 had no shims and the r/p went for awhile in my truggy. The 2.0 now is shimable and everyone is having issues. I would always shim it to where there was still a little high spot but mostly smooth, not notchy and the r/p would last all year long. When I would rebuild the diff I would check the shim but I lost more front r/p than rear. This truck makes noise. IDK where it comes from but it is noisy.