It’s not necessarily your transmission... The symptom you describe is very common with the 5.3L & 6.0L GM Engines. Cadillac, GMC, and Chevy recognize this problem being caused by either the Transmission Module and/or the Ignition Switch or simply adjusting the linkage on the transmission.
The way to be certain, the next time you experience this symptom after being stopped or at a stop light, keep an eye on the letter "D" above the steering column (P R N D 3 2 1), should the "D" disappear on the digital display, the problem will most likely be transmission module and/or the ignition switch. If the letter is still lit, your transmission requires the linkage to be adjusted.
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