It's been a while since I did the swap but I think there were 2 speed sensors? One in the trans and one in the tc output. I read somewhere that it compares the 2. I started over thinking it and it just wasn't working out in my head. I drove it around the block yesterday. It shifts 1-2, 2-3 seems weird, it shifts late and would only shift if I let off The gas. I didn't get up to speed in 2hi to see how it shifts.