Allison Transmission Questions Jimlin, Yes they are correct, once updated, you can not install your original calibration (CIN). The software automatically updates everything in the cal and the growl may have been cause from the cal or other problems. Allison is always updating the calibrations to make the transmissions work better. The shift points may have to adjust to your driving. Remember when you first bought the coach and the shifts were not right? It takes approx 2000 mile to get this calibration and ECU set up for you. It is constantly monitering your throttle and way you drive. The Allison dealer may have fast adapted the ECU but they drove it. When we test drive, we drive at full throttle to make the shifts. Please just give it a little time. I say good job to the shop if they repaired the either growl or vibration. These are the most difficult problems to solve. Thanks for the question and have a great day!