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The diagnosis should start with the easiest, least expensive proceedure. Jack up the rear, place the selector in neutral, hand spin the wheels, feel for restrictions, listen for unusual noises. That won't take a lot of time and shouln't cost anything.
Perhaps during re-assembly some debris entered and is binding one of the rear callipers, perhaps a calliper piston externded and was not retracted correctly, maybe the emergency cable has some tension applied.
It is possible that the symptoms that you described are related to one wheel binding.
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