We are restoring an 87 GT with t-tops.  We are almost done but are having problems with the power windows. They go up and down fine. Problem is about window goes up straight until it gets about 4" from the top and then window tilts to the front. We think we have loosened all the adjustment bolt, manually put the window in the correct position and then tighten it all down again but as soon as we put the window down and then up again it does the same thing.  Any ideas?