If your truck was built after Sept of 13 It SHOULD have the up date in it all ready. At least that's what I'm told by my dealer. 50k truck and it has no idea what to do when shifting. Clunks, bangs, shakes, and my dealer says its "performing as designed" as the work order states at the bottom. Interesting that there is a different transmission being installed in 15s Have always been a GM guy but drove a Dodge last weekend and will trade for a Ford or Dodge when the new ones come out. What good does a bumper to bumper warranty do if the back bumper falls off when the transmission falls out...... DON'T EVEN THINK ABOUT BUYING ONE YOU WONT BE HAPPY AND GM DOESN'T CARE.