LS4 Performance - Window motor questions

My drivers side front window has been making an awful squeeling sound when going down, no noise whatsoever going up and it hasnt lost any speed either. Been doing it for a few months now and it's finally beat me down to where I need to do something about it. Here's the question, are the motors for the drivers side front and rear windows the same? Thinking I can simply swap them and have the noisy one in the rear since it rarely if ever gets rolled down. I'm sure they're different, simply due to my luck, lol.

Has anyone experienced this squeeling sound? It's almost a grinding sound, but more of a hard squeel, it's hard to explain.

Joe.

Apparently they're different, went to rockauto and all different part numbers for all four windows :(

So, now basically I'm curious to see if anyone else has experienced this and knows what the heck is going on with it. Is the noise in the motor or regulator or simply rubbing on something in there??? It's just odd that it only does it on the way down.

I'd first check that it wasn't the rubber wiper before changing the motor, I had several windows that squealed going down but not up. There are 2 wipers, one below the other, you can see the outer one but not the inner one unless you hold back the wiper off the window. Clean them and put some silicone on them, if that is what it is, it will stop the sound.