Ron,
Do you still have your old door glass? You might want to compare the glass curvature. I have heard that the Vader conversion is very good. And I would imagine that it would over come minimal track binding.
In the past I spent countless hours adjusting and aligning the window tracks. The passenger side was horribly slow. Recently I converted to Taurus motors. Even with new track rubber the windows fly up and down.
My bet is if the window glass is not OEM it is probably the curvature.
Good luck,
Jeff
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