... How much time do I have? I am 500 miles from home.
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How high is up?
The proper answer is that it needs to be repaired. If it comes loose it can do a bunch of damage.
One possibility. The ring will pass over the serpentine belt pulley. Remove the serpentine belt, remove the separated ring, and re-install the belt.
That should get rid of the balancer failing.
Were I to try that I would keep my speeds down to 55 mph to keep engine rpm's down. That said, there may be rpm ranges where more vibration is noticed than in others. If discovered I would avoid those ranges.
There must be many people who have run the T1N with a partially failed harmonic balancer which wasn't doing the job.
To be clear. I have never tried what I suggest above. I have no idea what the risks of trying it may be.
Good luck.
vic