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Those diff bushing - also known as the "rear upper" ones - you gotta be careful with.
I've seen those UHMW (plastic) and aluminum (replacements), but this tends to transfer the stress into the "ears" of the diff housing itself.
I've seen the ears of the diff housing crack.
I would not replace the rear upper diff mounts with anything harder than PU (polyurethane), unless you get a diff brace...
Don't ask me where to get PU replacements; I don't know of anyone who is offering them fairly easily.
The only ones I know of are one-off custom made units.
Don't ask me about diff braces either...
I've only seen an FD one that can possible be retrofitted to our FC's...
-Ted
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