Something is jacked up with your drivetrain alignment. Engine and trans angle, angle of the rear end and placement of the carrier bearing all factor in. Also, since it’s bagged, you need to verify all those angles at multiple heights to see if there’s a particular spot it doesn’t like. I would suggest taking it to a reputable driveline shop and let them look at it. There’s so many variables here, there’s not a hard set answer unfortunately
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