[70cst10]

I'm almost ready to drive the truck now. I've come up on another problem, though. My laptop doesn't have a serial port, so I can't reprogram the computer right away. How will the motor and tranny operate if it's not set up for a 3.73 rear end? Will it screw with the shift points? Will it cause any damage? I'd rather not have to send the computer off to have it reprogrammed. Is that my only choice now?