I need to replace the rear main seal on my blazer. It is a '91 so I think it has the one-piece seal. I haven't pulled the flexplate off yet but the book says I need to drop the oil pan. Is it necessary to drop oil pan? Are there any tricks I should know about before doing this? One other thing, anyone know of a good place to get motor mounts that are tough but still retain the tabs that the inspection cover struts mount to?