window problem

[degussa]

I just installed a new window regulator on a '95 Crown Vic. The old one was shot. Now, when my window closes as it nears the top, the window slows down. I swapped the motor with another one on the car, but I got the same results. It appears that there is too much friction in the window channel. The new window regulator works smoothly.

Does anybody have any suggestions?

Thanks,
chris