I doubt your gaining on it changing to used tires with the same wheels. You might want to pull the tires off you rims and indicate the wheels at a good tire shop. You might have a bent rim. You would be better served if you did one thing at a time. It could help if you moved the tires and wheels...
How about some diagnosis being applied before parts are thrown at it? I've yet to read where you are feeling the "vibration". In your hands or under your ass? Admittedly, I'm late to this thread and haven't read every post so if I have overstepped, my apologies.
Again, I said as I said the same circumference not brand. Put a tape on the damn things so you know what you have. It is an open differential I believe not a posi or locker. If you were to park your truck in the sun for a few hours the tires exposed to the sun will "grow" in height but not...
Not to be argumentative but.... I was always of the belief that a tire as long as it was of the same circumference regardless of brand had no effect on the differential.
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