yeah....that is standard for our window motors....the motor is fine but the inner drive gear that the motor turns, is shot...it is plastic & is part of the motor assembly...
if you are mechaniclly inclined like some of us are.. it can be repaired rather easily........kinda hard to explain & I don't have any pics of how to do it....Maybe someone on here can explain it for you.....
in short,#1 remove the motor from the door, #2 take the gear cover off of the motor assembly,#3 remove all of the "chewed up plastic gear" #4 clean the grease off of the inner assembly & #5 fill the "void" where the gear used to be.. with jb weld or something of that nature......installation is the reverse of removal....
like I said, it is hard for me to explain but I think if you get the motor out, apart & find the disentegrated plastic gear...my rambling will make much more sense...
the gear that is destroyed...shouldn't have been a gear to start with...it is there to go bad so you will have to buy another motor....
hopefully someone else can describe the repair better...good luck with it.
"disclaimer"::: "information is to be taken with a grain of salt." there is no gaurantee that your motor is not bad.....BUT, in every case I have dealt with....the motor was fine but the gear was bad.....the above JB weld procedure has worked flawlessly for me several times...