If there is a vibration with trans in neutral and engine shut off while coasting and still a vibration with engine running, car sitting still and clutch pushed in, then you have 2 different problems or your mount/crossmember is looking like the culprit. I find it hard to believe you have 2 different problems and can't identify/isolate 1 of them. Swap that cracked crossmember, that seems to be the common piece right now.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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