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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...
  2. Transmission Shop
    Recently I've noticed a hum at highway speeds and have narrowed it down to only happening in overdrive. My truck seems to shift fine and the fluid levels are good. I've changed the spin-on recently and am running Transynd. Is this humming normal or should I be concerned? I have no other...
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