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I would recommend sending it off for balancing. I dont know about that particular shop, but I know that many shops cannot do high speed balancing and you'll then have vibrations.
I'm by no means a driveshaft expert and I also live in the south where nobody can do anything right but despite what a lot of shops seem to say about "balanced is balanced at any speed", that doesn't seem to be true and there are only a few places in the states that can do high speed balancing. There are two trains of thought:
1) if it's balanced at 3,000 rpm it's balanced at 10,000 rpm
2) there are certain resonances that can happen at different rpms requiring high speed balancing
I'm in the second camp, but it could just be that every shop in my area is completely incompetent (which wouldn't surprise me at all) lol
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