Great thread!!!! both of my rear windows haven't worked in almost 2 years and my front passenger just started acting up, i removed the whole regulator and motor assembly from the passenger's rear and locked it in position, the other one stays half way open all the time for my pup, two year old GSD. Luckly i kept my rear passenger regulator assembly, i opened it up today and same issue, those bushing where completely gone, called my local parts store (O'reilly) and found the "gear rebuilt kit" which has the large plastic gear and the 3 bushings for $18, discount thru my shop, normally retails for $33, now i dont think i need the new gears so i will call around and find just the bushings to fix all of them this weekend