I'm new to tuning, and won't have my MPVI2 until Thursday! I am doing a swap from a 2017 Silverado to a 72 El Camino. Engine is L83 5.3L with 8l90E. I think I will just need to play with the shift points so I'm not shifting like a truck. Will the TCM need to be unlocked to do this, or will I have to send it in to HPTuners?