Torque converter is failing. TCC clutch starts to delaminate, then hot spots develop and lead to steel on steel. Converter grindings then dump directly into the pump, scoring it, then the fluid pressure starts to drop, compounding the issue. Then, the 4,5,6 clutch starts to slip due to low pressure, burning those clutch plates.
The root issue is not the transmission, but the fuel economy tune in the transmission that engages TCC early (low speeds), over working it. GM didn't change anything in the transmission to cope with this increased demand from the TCC components. The 6L80/90E has changed very little over its design life, but the converter failure is a '14 up issue. I usually see them fail between 80-120K, unacceptable.
Make sure however you decide to have it fixed, that the converter installed has a billet steel front cover. If a shop is rebuilding yours, it will need a converter, a front pump, and I would recommend making sure the 4,5,6,R drum is replaced. The 456R drum is a high failure piece on all 6L80/90E. Also make sure the cooler bypass thermostat upgrade is done lower operating temp, that is another '14 up problem. A custom tune to delay TCC engagement wouldn't hurt, either, but will reduce fuel economy.
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