So I have an 18 JLUR auto w/ 4:10's. I installed a skyjacker 2.5 lift and 37's. I had to wait about 2 weeks for a flashcal. In the mean time my mileage dropped (I knew it would). I also barely see 7th and never see 8th gear. My question is coming, I promise. So the flashcal showed up last night and I changed the tire size to 36.5. I saw no change at all on my way to work. Here's the question: How long will it take to get those higher gears back? Does the computer have to "re-learn"? Or are they gone for good (without a re-gear)?