Worn-Out Clutch Lining: The clutch lining Within the torque converter is to blame for engaging and disengaging the transmission. Use and tear around the clutch lining can result in slippage, shuddering, and reduced effectiveness. As you may see, there in no immediate (mechanical) link among the impeller and the turbine. https://torqueconverterclutch18539.angelinsblog.com/33139745/rumored-buzz-on-torque-converter-clutch