Stock shaft that had been balanced and set to bolt to the 9" axle.
There is no evidence of rust or other damage to it. The trans mount is secure...and there is simply no other explanation.
The dyno guy said that sometimes when there is a little bend or unbalance situation in the shaft they will do this.
The drive line angle is good and I can't imagine the dyno put more stress on it than normal street driving.
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