My front passenger window will not close right. it goes up all the way then falls down 1/2 to 1 inch. If it does close all the way and you slam the door the window falls an inch. Does this sound like a bad regulator? i took the panel off but can't find anything obviously wrong. Window motor sounds healthy. Closing the window right at the top of its travel it bounces and falls down an inch ( best way i can describe it).

thanks for the input.

__________________
________________________________
1980 300CD - 130,000 Daily Driver
1984 300CD - 325,000 Dad's summer cruiser

1977 K10 - The Grinch - lifted, locked, winch, 37's. Beadlocks.. 379 t Detroit Diesel
1956 Willys Wagon - buick 225 oddfire v6
1982 SJ 410