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According to Thrasher Engineered Performance.......
As most of you already realize, our transmission (known as a 4T65e) is electronically controlled by the engine / transmission computer (PCM - Powertrain Control Module). Shift points, TCC (Torque Convertor Clutch) lockup, and line pressure are all controlled by the PCM programming. Fortunately, the factory engineers gave us a choice of a normal shift pattern and performance shift mode for slightly firmer shifts and more aggressive shift pattern.
Not sure this helps.
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