If someone doesnt use a proper puller to remove the balancer, or worse yets hammers on it, that might cause a problem. I have heard of, but not personally seen, the outer section of a balancer slipping around the inner, causing the timing mark to be off.
But as PWD stated, your vibration is likely elsewhere. If it occurs at a cetain vehicle speed, then its definately in the drivetrain . If it
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Dodge Sweptline Truck General Discussion