Starting line ratio

Also your torque converter is a torque multiplier ......going to a lot of difference between a 3000 rpm and 5000 rpm launch in the amount of torque ,,,,,
I was trying with the idea of swapping my 3.55 chunk in the car and see how it does. But I kinda think it will hurt more than it helps.. plus I'm planning on a new trans and this time I'm not getting a low gear first.