Originally Posted by Mikereal12 Ive already gone through all those and couldnt find a 12585950 calibration with the 4l60e option on there... Is it bad to run my truck with it set to 4l80e or do I need to change it (setting says never change it) The attached is a 2004 _ 4.8 / 4L60E OS 12585950 VIN 2GCEK19V441108877
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