Originally Posted by elh0102
This is not a good process by written directions. If by flat gray part you are referring to the rear portion of the diff which contains the cooling fins, no, that is not the location I suggest. I remember the diff housing being black, not gray, but I haven't been under the car lately. But, it is forward of where the axle shafts connect, not visible from the position from which the photo was taken. If you are inexperienced in this type thing, please get some on-site instruction from a competent tech.
You remember correctly, the diff housing is painted black. I asked a master tech at the dealership where to use a floor jack to lift the rear of the car and he showed me to place the lifting pad of the jack under the black portion of the diff.