Review on Dorman 740-664: Premium Front Driver Side Window Regulator for Ford/Mercury Models, Black - Top-Quality Replacement Part by Bryan Murphy

I generally like Dorman products but this one was disappointing. The white plastic molding that holds the lift to the track had numerous small cracks. These weren't large open cracks, but rather micro cracks that were obvious enough to be concerned about. They seemed to come from the manufacturing process. My box was in perfect condition. It was obvious to me that the cracks were there when it left the factory as grease was rubbed into it. This white plastic is very important, and if the cracks get bigger, it will lead to the failure of the device. This is a high voltage area. I sent it back to Amazon for a replacement and they sent me another one, but this one also had some small tears in the same general area, but not as many or as bad. Not wanting to roll on another potentially cracked block, I opted for a partial refund from Amazon and kept the slider. Cracks have already disappeared), how long does it last in operation. The time will show. So far it's working well, but with all the work that goes into removing your old unit and replacing it in the door, I have to say I was disappointed that Dorman didn't do a better job of quality control to come around to test this, and especially this part. controller. So far it's working well and fitting well, but I've been embarrassed to put something in the car that was wrong from the start.