On the GP's from 1997 on, the regulator was redesigned. Both my rear windows became loose, would just go down from normal driving vibrations. Then drivers went down & stayed down . Bottom line, I fixed all 3 at a glass shop, cost was $400 for rears & $500 for front. BTW, this was spread over a period of 18-24 months, price went up on front during this time. Rich