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John (not verified)    December 5, 2024 - 8:30PM

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Same issue at 115K miles.... Torque converter shutter. Goes away if you go to trailer tow mode and lock up torque converter...GM 8 speed uses carbon fiber on torque converter clutch which greatly improves durability and resistance to burning/glazing.Trans flush usually clears shutter issue. No need to drop pan, or replace filter.

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