rear disc from grand cherokee on a 8 3/4

ramenth said

. . . Thanks for putting up the link for us. But I think the gist that some are looking for is a donor you-pull-it junkyard kind of swap, say like with the Cherokee straight-up swap to the 8 1/4. Unbolt from one car, bolt directly onto the other. . .

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The only direct Mopar swap I'm aware of is from a 74/75 Imperial. IF (and that might be a big if) you can find a donor - a 74 or 75 Imperial that had the rear disc brakes will swap to the 8.75. Biggest issue is the rotors are virtually impossible to find. Doesn't really constitute a feasible swap but it is a remote possibility.