Not sure if you have an Auto Trans but, when I had the Pacbrake installed I had the shop replace the trans pan with a deep pan, new fluid, check the bands and add Trans temp gauge (which I've also wanted for years). I was a bit worried about possible stress on the 48RE auto. It took a while for the 05 to be supported by PacBrake and as I recall it was due to the 48RE. Obviously they've since figure out how to work with it and none of this may apply to the 06.
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