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  1. 01-04.5 LB7 Duramax Powertrain
    Hey all, I am experiencing a distinctive whine/hum - almost sounds like an electrical type of whine, when my TC is locked. I have done lots of research and cant seem to find any definitive answers on what it could be. The truck has: -Fresh transyd fluid with new internal filter and new allison...
    allison hum hum lb7 torque converter whine
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