I'm a copier tech but not an auto technician. However, after getting quotes for water pump replacement and brake job w/caliper replacement, my anger drove me to do these myself...100% success.. Now I'm facing 1 last mountain..Driver side window will go down smoothly 1/2 way and begin making a very loud (gear?) noise and then stops. Only a small amount of help will smoothly lower the window without noise. ANd only a small amount of assistance will bring the window up smoothly..no binding or noise..Is this more likely the motor or regulator? Or a gear? It always stops in the exact same place when the noise begins. I'm surprised such a loud noise stops with such a lite amout of pressure. In my copier world I would be looking for a gear. Is this an entire assembly? With the door panel off, I can put my hand on the motor/regulator and it really doesn't vibrate or shudder. I haven't taken this assembly off yet. Anyone willing to offer input??