balance your driveshaft, make sure that all the weights are on it. My buddy who is a member on here and pt.net lost a weight on his ds, and the other night he was doing 100 and got a vibration so he slowed down. When he got to about 95 it was murder she wrote. it blew the output shaft out of the tailshaft. here's some pictures, enjoy. another dead 4l60e
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