That big old bushing is filled with silicone, not grease. And it's nasty. When that bushing goes bad. It normally leaks down the diff cover. The bushing has 2 chambers filled with the silicone. Only one chamber normally lets go.
I've installed 3 diff bushings so far. 2 SPL's and 1 Z1. The SPL's were easier to install. They're a solid bushing, where the Z1 is poly. The poly moves around during installation. The poly transmits less vibrations.
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