I found at least part of my problem. I had a control cable going to the spindle drive that was laying parralell to, and touching leads comming out of a transformer just below and to the left of the drive. I figured there was a possibilty of noise or interferance so I moved them about three inches back away from each other. Then tried the spindle out, it worked in the highest gear at least up to 800 rpm (checked ok with a tach) this gear covers 150-1800 rpm, I don't want to turn it faster than about 800 rpm with the large chuck on it. But, in the three lower gears it only works toward the lower end of their ranges. I think the gear shift I/O must be working, as it completes all of the four programmed shifts ok, just will not spin at higher rpms.