Okay, pulling up the speedometer window, a stock PCM is reading the following info.

24.72 tire size
47992 vss pulse/mile
3.46 final drive ratio
40.0 rev - trans
2448.5741 trans rev/mile

Is the speed sensor in the trans on the 04 GTO? I thought the T56 had the 17 tooth speed sensor ring inside the trans. Why does HP report 40 pulse/rev-trans