Maybe I'm just too finicky and cautious, but I had one heck of a time getting that seal out, even with the differential out of the car. The center pinion is in the way, and mangling the seal would seem to have involved marring and maybe mangling the seal housing. I was able, finally, to use an improvised puller where shoulders of the pulling rods tucked under the seal ridges and the center stud pressed on the pinion shaft. Needless to say, it was a small, compact puller. Hope that's not too obtuse an explanation.