Question - 1971 Dart Swinger Rear Windows

Howdy Mopar Dudes,

I noticed with the 1970 Swingers the rear windows roll all the way down where as on the 1971 Swingers they don't roll all the way down. They stop short a couple of inches, at least on mine they do. Was this a saftey feature introduced on the 1971's and if so is there any way to adjust them so they will roll all the way down?

Thanks,

James