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|4 speed approaching 120K. Differential is noisy and sloppy. Loudest going downhill. When rear of car is up on jack stands and I rotate one wheel back and forth I am amazed at how much slop is present. Haven't read anything about what happens next or seen anything about rebuilds or replacements. Does it sort of run forever, just sloppier and sloppier? Can a backyard mechanic adjust it and/or are they rebuildable? Has anyone engineered a replacement experience like the Toyota transmission swap? Is this the Achilles heel that finally kills a JH?