Hi, I am Juan New Guy. I just completed a 350 tbi to 454 vortec swap in my 1994 full-size Blazer and since my hands were already dirty, I went ahead and replaced the 4l60e with a 4l80e and since I had a 14 bolt SF I went ahead and replaced the 10 bolt rear end. Now for the black box....They told me that you might be able to help me fine tune it. Thanks!-Juan Mendoza.