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Because the "Harmonic Balancer", aka, "Cranshaft Pulley" is actually a 2 piece, part. The hard rubber center hub sometimes loses its way, and once it starts 'wobbling', it eventually fails. Symptoms include belts coming off the pulleys, and also them breaking, both in half, and by splitting sideways (making the belt thinner, to accomodate for the new alignment).

Part can be found at most auto parts houses, for about $50.

Needs to be put on with an impact wrench!

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Q: Why would a Chevrolet venture crankshaft pulley be out of line?
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