Top Fuel Driveline Shafts

Does anyone happen to know (or can you measure) the rough mean diameters of the input and output shafts in a Top Fuel application? Spline count would be helpful to know too. Just curious, thinking about something at the moment, and of course none of the manufacturer's will be around until Monday at this point.

 

1 7/8" 10 spline I believe, input. 1 3/4 40 spline to driveshaft.

 

Thanks !