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Thank you all for your answers — I will take all feedback into consideration. As of now, the dealership told me the transmission may be defective. Luckily, I have GM’s Powertrain warranty. In addition, the dealership is going to thoroughly inspect all components to give me a final answer by tomorrow.
Also my ZL1 is almost fully stock as I installed a Borla ATAK Catback and a Rotofab CAI; no tune.
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