I'm somewhat confused. Your Newport is two speed, your orginial is one speed. What is your control switch?
I'm not sure what you're confused about. In fact the factory 55-57 GMC electric wiper motor is two speed as well. I have confirmed that this motor is correct and original to the truck using the GMC master parts book. The factory switch control is a cable, just like the vacuum motor would have used. The switch itself is onboard the wiper motor. The Newport motor uses an electric switch.
I just got the factory motor reinstalled in the truck. What a nightmare of contortion that requires... A few years away from being under that dash and I forget. The motor runs strong in both speeds, but for some reason it's not going through the complete return to park. It's parking at 90 degrees straight up rather than horizontal along the bottom edge of the windshield.
Does anyone have a service manual for these wiper motors that might shed light on what I can do to fix this issue?
