[dbuck]

Originally Posted by R Bedell

Check the "spirol pin" at the coupler, to the input shaft, of the Sundstrand Hydro, to see if it allows the shaft to rotate at engine speed.

I know you explained where this pin is located. But I will be darned if I could find one. I did find a spline shaft out the hydro and a spline coupler on the driveshaft.