4x4 shifting at high rpm's?
 

turbo'd 2013 silverado 1500 4x4 ltz, 6.2 with 6l80 trans. My truck is shifting like it should in 2wd, right around 6k rpm. In 4x4 high, it's shifting closer to 7k rpm's, slapping the rev limiter and falling off. I have it tuned with HP. Where in the software do I go to adjust this down to closer to my 2wd rpm? TIA